Pikachu

Pikachu is the mascot of the Pokémon franchise. Pikachu is a yellow mouse Pokémon with red electric pouches on his cheeks. It has a zigzag tail that has a a heart on the end if it is female.

Description:

This Pokémon has electricity-storing pouches on its cheeks. These appear to become electrically charged during the night while Pikachu sleeps. It occasionally discharges electricity when it is dozy after waking up.