I've researched about Twilight Sparkle and found two things, one she is a princess.
And so far, the only connection I see they the favorite color purple.
................
... Really DEATH BATTLE?!?! That's the best connection you can come up with?! The fuck!
If you ask me guys I think these are the better options:
Stella from Winx Club (Light vs Darkness)
Inuyasha or Vergil (Battle of the Demons
Scarlet Witch (Daughters of evil fathers)
Adam: Aaah. That feels much better.