NOTE: ASSUME ALL THE ONIS CAN ONLY EQUIP TO OTHER ONIS. I'M GOING TO START FIXING THEM TO SAY THAT SOON.
Main Deck monsters

Jigokunoni
If this card attacks, card effects that activate in your opponent's hand are negated, until the end of the Damage Step. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Shiboni
When this card attacks a monster: Halve that target's ATK and DEF during the Damage Step. Each time this card destroys a monster by battle: This card gains 300 ATK. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Kanaboni
This card gains 100 ATK for each face-up monster your opponent controls. If this card attacks a Defense Position monster, inflict piercing Battle Damage to your opponent. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Amazoni
When this monster battles an opponent's monster, unless the opponent's monster is destroyed by battle: It is returned to the bottom of the owner's Deck at the end of the Damage Step. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Demoni
If this card destroys a monster by battle: You can Special Summon 1 Level 4 FIRE monster with 200 DEF (from your Deck), other than a monster with this card's name. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Hadoni
If your opponent activates a card effect that inflicts damage to you; Negate that damage, and this card gains ATK equal to that damage until your opponent's next End Phase. If this card attacks, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Sonshoni
You can send 1 face-up Equip Card you control to the Graveyard to destroy 1 card your opponent controls. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Usoni
You can switch this face-up Attack Position card to face-up Defense Position to target 1 Defense Position monster your opponent controls; Destroy that target. If it is a Flip Effect Monster: Special Summon it to your side of the field in face-down Defense Position. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Kemononi
This card is unaffected by the effects of Trap Cards. If your opponent activates a Spell Card: You can Tribute this face-up card; negate the activation of the Spell Card and destroy it. This effect can only be activated during the opponent's Main Phase. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Sapotoni
Once per turn, you can Normal Summon 1 "oni" monster in addition your Normal Summon or Set. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Buredoni
If you control a face-up "Bushidoni": You can Special Summon this card (from your hand). If this card destroys an opponent's monster by battle: It can attack once again in a row. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Shizuoni
All face-up Special Summoned monsters your opponent controls lose 400 ATK and DEF for each face-up "oni" monster you control. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Midoni
Once, while this card is face-up on the field: You can have this card lose 300 ATK; Destroy 1 Spell or Trap Card on the field. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Bushidoni
If you control a face-up Level 4 Fiend-Type monster, other than "Bushidoni": You can Special Summon this card (from your hand). If this card attacks a face-down Defense Position monster: Destroy that monster (without applying damage calculation). Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Ijimekkoni
You can return 1 face-up monster you control to the hand; Special Summon this card (from your hand). When this card destroys an opponent's monster by battle: Special Summon 1 "Oni Token" (Fiend-Type/FIRE/Level 4/ATK 1500/DEF 200). This Token cannot be Tributed for a Tribute Summon. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Sumatoni
If this card destroys a monster by battle: You can add 1 "oni" card from your Graveyard to your hand. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Momoni
If you control a face-up Level 4 Fiend-Type monster, other than "Momoni": You can Special Summon this card (from your hand). Once per turn, this face-up Attack Position card cannot be destroyed by battle. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Jigokunoni
If this card attacks, card effects that activate in your opponent's hand are negated, until the end of the Damage Step. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Shiboni
When this card attacks a monster: Halve that target's ATK and DEF during the Damage Step. Each time this card destroys a monster by battle: This card gains 300 ATK. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Kanaboni
This card gains 100 ATK for each face-up monster your opponent controls. If this card attacks a Defense Position monster, inflict piercing Battle Damage to your opponent. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Amazoni
When this monster battles an opponent's monster, unless the opponent's monster is destroyed by battle: It is returned to the bottom of the owner's Deck at the end of the Damage Step. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Demoni
If this card destroys a monster by battle: You can Special Summon 1 Level 4 FIRE monster with 200 DEF (from your Deck), other than a monster with this card's name. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Hadoni
If your opponent activates a card effect that inflicts damage to you; Negate that damage, and this card gains ATK equal to that damage until your opponent's next End Phase. If this card attacks, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Sonshoni
You can send 1 face-up Equip Card you control to the Graveyard to destroy 1 card your opponent controls. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Usoni
You can switch this face-up Attack Position card to face-up Defense Position to target 1 Defense Position monster your opponent controls; Destroy that target. If it is a Flip Effect Monster: Special Summon it to your side of the field in face-down Defense Position. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Kemononi
This card is unaffected by the effects of Trap Cards. If your opponent activates a Spell Card: You can Tribute this face-up card; negate the activation of the Spell Card and destroy it. This effect can only be activated during the opponent's Main Phase. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Sapotoni
Once per turn, you can Normal Summon 1 "oni" monster in addition your Normal Summon or Set. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Buredoni
If you control a face-up "Bushidoni": You can Special Summon this card (from your hand). If this card destroys an opponent's monster by battle: It can attack once again in a row. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Shizuoni
All face-up Special Summoned monsters your opponent controls lose 400 ATK and DEF for each face-up "oni" monster you control. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Midoni
Once, while this card is face-up on the field: You can have this card lose 300 ATK; Destroy 1 Spell or Trap Card on the field. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Bushidoni
If you control a face-up Level 4 Fiend-Type monster, other than "Bushidoni": You can Special Summon this card (from your hand). If this card attacks a face-down Defense Position monster: Destroy that monster (without applying damage calculation). Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Ijimekkoni
You can return 1 face-up monster you control to the hand; Special Summon this card (from your hand). When this card destroys an opponent's monster by battle: Special Summon 1 "Oni Token" (Fiend-Type/FIRE/Level 4/ATK 1500/DEF 200). This Token cannot be Tributed for a Tribute Summon. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Sumatoni
If this card destroys a monster by battle: You can add 1 "oni" card from your Graveyard to your hand. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.

Momoni
If you control a face-up Level 4 Fiend-Type monster, other than "Momoni": You can Special Summon this card (from your hand). Once per turn, this face-up Attack Position card cannot be destroyed by battle. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains this card's effects.
Extra Deck monsters

Saikoni
Must be Xyz Summoned by using 2 Rank 4 "oni" Xyz Monsters you control that were not Xyz Summoned this turn as the Xyz Materials, and cannot be Special Summoned by other ways. (Xyz Materials attached to that monster also become Xyz Materials on this card.) Once per turn: You can detach 1 Xyz Material from this card; Special Summon 1 Level 4 Fiend-Type monster from your hand or Graveyard. Its effect(s) are negated, and its ATK becomes 3000. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster's original ATK becomes 4000.

Wendigoni
Must be Xyz Summoned by using an "oni" Xyz Monster you control that was not Xyz Summoned this turn as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card; send up to 4 FIRE monsters with 200 DEF from your Deck to the Graveyard. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster's original ATK is doubled.

Sakuranonihana
3 Level 4 Fiend-Type Monsters
Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card and send 1 "oni" Equip Card you control to the Graveyard; Special Summon 1 FIRE monster with 200 DEF (from your Deck). Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster's original ATK becomes 2800.

Busoni
2 Level 4 Fiend-Type Monsters
This card gains 200 ATK for each "oni" monster equipped to it. Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card; Send 1 Equip Card equipped to this card to the Graveyard. Then, destroy 1 card your opponent controls.

Enmaoni
2 Level 4 Fiend-Type Monsters
Once per turn: You can detach 1 Xyz Material from this card; until your opponent's next End Phase, the monsters you currently control cannot be destroyed by card effects, and if they attack a monster, the target monster's ATK is halved during the Damage Step.

Nenshoni
2 Level 4 Fiend-Type Monsters
Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card to target 1 other face-up "oni" monster you control that is equipped with an "oni" monster(s); Special Summon as many "oni" monsters equipped to that card as possible.

Helloni
2 Level 4 Fiend-Type Monsters
Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card: Special Summon 1 Level 4 "oni" monster (from your Deck). Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains 400 ATK x its own Level.

Saikoni
Must be Xyz Summoned by using 2 Rank 4 "oni" Xyz Monsters you control that were not Xyz Summoned this turn as the Xyz Materials, and cannot be Special Summoned by other ways. (Xyz Materials attached to that monster also become Xyz Materials on this card.) Once per turn: You can detach 1 Xyz Material from this card; Special Summon 1 Level 4 Fiend-Type monster from your hand or Graveyard. Its effect(s) are negated, and its ATK becomes 3000. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster's original ATK becomes 4000.

Wendigoni
Must be Xyz Summoned by using an "oni" Xyz Monster you control that was not Xyz Summoned this turn as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card; send up to 4 FIRE monsters with 200 DEF from your Deck to the Graveyard. Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster's original ATK is doubled.

Sakuranonihana
3 Level 4 Fiend-Type Monsters
Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card and send 1 "oni" Equip Card you control to the Graveyard; Special Summon 1 FIRE monster with 200 DEF (from your Deck). Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster's original ATK becomes 2800.

Busoni
2 Level 4 Fiend-Type Monsters
This card gains 200 ATK for each "oni" monster equipped to it. Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card; Send 1 Equip Card equipped to this card to the Graveyard. Then, destroy 1 card your opponent controls.

Enmaoni
2 Level 4 Fiend-Type Monsters
Once per turn: You can detach 1 Xyz Material from this card; until your opponent's next End Phase, the monsters you currently control cannot be destroyed by card effects, and if they attack a monster, the target monster's ATK is halved during the Damage Step.

Nenshoni
2 Level 4 Fiend-Type Monsters
Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card to target 1 other face-up "oni" monster you control that is equipped with an "oni" monster(s); Special Summon as many "oni" monsters equipped to that card as possible.

Helloni
2 Level 4 Fiend-Type Monsters
Once per turn, during your Main Phase: You can detach 1 Xyz Material from this card: Special Summon 1 Level 4 "oni" monster (from your Deck). Once per turn, during your Main Phase, if this card is in your Graveyard: You can target 1 face-up Fiend-Type monster you control; equip this card to that target. The equipped monster gains 400 ATK x its own Level.
Spells

Saigoni
When you control no face-up monsters: Special Summon 1 Level 4 or lower "oni" monster from your Deck, then take damage equal to its ATK.

Onigatojoni
Choose and activate 1 of the following effects:
● Add 1 Level 4 Fiend-Type monster with 200 DEF from your Deck to your hand.
● Send 1 Level 4 Fiend-Type monster with 200 DEF from your Deck to the Graveyard.

Shokanoni
Target 1 monster your opponent controls; switch it to Defense Position. Special Summon 1 Level 4 "oni" monster (from your hand), then the target monster loses ATK and DEF equal to the Special Summoned monster's ATK.

Gekidoni
Target 1 face-up "oni" monster you control; until the End Phase, it gains 800 ATK, and if it battles an opponent's monster: That monster's effect(s) is negated until the End Phase.

Saigoni
When you control no face-up monsters: Special Summon 1 Level 4 or lower "oni" monster from your Deck, then take damage equal to its ATK.

Onigatojoni
Choose and activate 1 of the following effects:
● Add 1 Level 4 Fiend-Type monster with 200 DEF from your Deck to your hand.
● Send 1 Level 4 Fiend-Type monster with 200 DEF from your Deck to the Graveyard.

Shokanoni
Target 1 monster your opponent controls; switch it to Defense Position. Special Summon 1 Level 4 "oni" monster (from your hand), then the target monster loses ATK and DEF equal to the Special Summoned monster's ATK.

Gekidoni
Target 1 face-up "oni" monster you control; until the End Phase, it gains 800 ATK, and if it battles an opponent's monster: That monster's effect(s) is negated until the End Phase.
Traps

Duoni
Tribute 1 "oni" monster you control; Special Summon 2 "Duoni Tokens" (Fiend-Type/FIRE/Level 2/ATK ?/DEF 200). Their ATK are equal to half the original ATK of the Tributed Monster, and they gain the Tributed monster's effect(s). These Tokens cannot be used as Synchro-Material Monsters.

Reidoni
Can only be activated when your opponent Special Summons a monster(s). Special Summon 1 Level 4 "oni" monster (from your Deck).

Konigeki
Switch 1 face-up Attack Position "oni" monster you control to face-up Defense Position to target 2 cards your opponent controls. Send them to the Graveyard.

Raijinoni
Send 1 "oni" monster from your Spell & Trap Zone to the Graveyard; Destroy 1 card your opponent controls.

Duoni
Tribute 1 "oni" monster you control; Special Summon 2 "Duoni Tokens" (Fiend-Type/FIRE/Level 2/ATK ?/DEF 200). Their ATK are equal to half the original ATK of the Tributed Monster, and they gain the Tributed monster's effect(s). These Tokens cannot be used as Synchro-Material Monsters.

Reidoni
Can only be activated when your opponent Special Summons a monster(s). Special Summon 1 Level 4 "oni" monster (from your Deck).

Konigeki
Switch 1 face-up Attack Position "oni" monster you control to face-up Defense Position to target 2 cards your opponent controls. Send them to the Graveyard.

Raijinoni
Send 1 "oni" monster from your Spell & Trap Zone to the Graveyard; Destroy 1 card your opponent controls.



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