All right, here's my entry. I was thinking something on the lines of anti-Link Monster decks that potentially also utilize Link Monsters. I can also see this going well with something like a Goyo or Graydle deck, assuming you're facing an opponent who uses Link Monsters, so I guess the rival I'm imagining would somehow be able to claim his opponent's Link Monsters and Synchro Summon using them.
And yes, I know that I just said he'd use Link Monsters to Synchro Summon. Don't you just love card effects that manipulate the rules sometimes?