I would go for a villain.
Dragonlord, Zoma, or Psaro.
Dragonlord:
Good size. Wouldn’t need a Menu. His abilities would basically be Frizz/Frizzle/Kafrizzle. He could transform into his giant purple dragon form. He would also represent DQ1.
Zoma:
He would use a bunch of different ice based spells, as well as Disruptive Wave which would debuff his opponents instantly.
Only problem is that he’s huge (but could be tweaked to be K.Rool’s size).
Psaro:
Could be pretty amazing. A badass character with a ridiculous transformation.
Problems are he would be another swordsman, and would also wield powerful magic. Also he has a similar design to Sephiroth and Alucard.