I wanted to give Thunders some love because they really deserve/need it. They got some pretty cool cards: The thunder family, Rai-Oh, Denko Sekka, Zap Mustung, Vylon Prism, Thunder Dragon, etc. So the cards above are here to make Thunders be a META! (I hope x3), so let's about them:
Thunder Rider is a great add to the Thunder Family, since "Brohunder" is by far the only legitimate searcher Thunders got (we don't talk about Thunder Sea Horse). So the combo is: Summon Mu-Pahunder, then NS brohunder, add Rider with bro's effect, use rider effect and reveal another Thunder in your hand: Now you are seraphenited!
Thunder Lord Rai Tho is your mvp, NS either with your Normal Summon or with Pa-Mahunder, SS another Thunder from the Deck: Now this, this is beautiful, if you choose to SS Raider, now you can activate its 2nd effect, salvage a thunder and gain an Extra Summon, again! (remember, Rai tho disable any SS from the Deck, unless it's a Thunder!)
Keep in mind that both "Rai Tho" and "Rider" don't support "Thunder-King" and "Denko"
Thor and Akuma-Rai are both Extra Deck options for Thunders, Thor is Drident, who Trigger Rai-Tho second effect. Akuma-Rai is a nice card that boost-up the speed of Thunder plays.
Mjolnir cause why not! It boost your Thunders ATK, and if they were SS monsters they got protection AND you can also use it on your opponent's monsters, destroy them, then re-equip it to a Thunder monster you control!.