Napse

A Shinapun is a Lil' Sparky enemy inside Bowser's stomach in Mario & Luigi RPG 3. It is made of slime of some kind with a red nucleus at the center. It will attack Mario or Luigi by throwing energy balls that are colored either red, blue, or green.

Trivia

 * Its name comes from 「シナプス」 Shinapusu, meaning synapse.