Bear

Gentle scientist hiding monstrous, unstoppable rage beneath the surface.

The bear perfectly captures the duality of Bruce Banner and the Hulk — normally a calm, intelligent, introverted figure who transforms into an overwhelmingly powerful and territorial force when threatened or angered. Bears are known for their deceptive tranquility masking raw, explosive strength. Like Banner, a bear would rather be left alone, but when provoked, the reaction is earth-shaking.