Undertale Oswald is just Classic Oswald in Undertale and a RP antagonist in Abandoned Discovery Island.
Undertale Oswald appears to be Oswald in a more Undertale fashion. He looks to be black and White in appearance like a Sprite.
the battle is a current fnati character fight and if you beat he will use his jumpscare and die.
Undertale Oswald will try to damage the players soul and uses a few attacks to do it that continue to be used here are some examples:
He can use Bunny heads to hurt the player's soul they can come in the following colors: White, Orange, Blue, and Green.