E-04 Leon is an E-Series robot created by Dr. Eggman. It is modelled on a chameleon and is also quite similar to the classic Badnik Newtron. It creeps along floors and walls slowly in hopes of ambushing its targets. It has a phase/cloak system that renders it invisible and intangible, meaning it cannot be struck while camoflaged. It decloaks as it sneaks up on prey and attacks by lashing out with its whip-like tongue. It also has excellent reaction time and can phase-cloak almost immediately as an enemy attacks it.