I feel like Simon Belmont is perfectly crafted for this game and it's sad that he'll get passed over for less iconic characters.
First, his moveset just screams "Smash Bros." He has the holy water, the axe (perfect for anti-aerial attacks), boomerang cross, dagger and for his smash move- the holy cross. Then there are all the music remix and stage possibilities. Vampire Hunter, Simon's Theme and Bloody Tears. If this game had Simon Belmont, Mega Man and old school looking Sonic in one place, I'd be too happy. Like a childhood dream game.