This game has unused graphics.
A full-on conversation with Canvas, plus some additional sprites
No relation to an early title for a game on a rivaling system, Willy Wombat is a top-down action-puzzle game only released in Japan, despite having (rather corny) English voice acting.
Alternate portaits for Willy exist in the game, with a slightly more ambiguous mohawk and a few portraits not in 3/4 view.
An unused character named Canvas. Despite being named in the credits, they don't appear in the game proper.