Jelloween

Jelloween was a special type of Jel spawned during Wave EX-H: Spooked Campground, which functioned as a Halloween-themed foe...as you have probably guessed from the names listed in this sentence.

It featured a unique ability which has been removed from Jels, Slimy Body, which could render assailants unable to leave their current position without wiping themselves off somehow after striking Jelloween in close combat. It was also noted to be self-aware, and it was capable of Earth-themed magic spells. Other than this, it was a pretty typical Jel - small and relatively easy to dispatch.