XLL

XLL was created by Twitter user @Inferno_Plumber.

Biography
XLL all started with being a beta test for SMB3. Surprisingly, they didn't start making Mario's sprites first. They went with making Luigi's sprites just for the fun of it. He was used to playtest things and would be used to first try out mechanic. But after this beta test Luigi was done being used, the developers at Nintendo forgot to delete him, more so pushing him to the very back of the games code. Practically pulling a carpet over a hole in the floor. The Luigi was all alone, stuck in a mess of code and scripts. Since his code was never updated, it would get meshed along with other lose code in the game, slowly turning him into the deformed Luigi you know now as XLL. It forever yearns for it's brother, roaming the place where all the lost code resides (The Green Rooms.) The only way to reach The Green Rooms is going out of bounds, past the green line that's barely seen onscreen. From there, you'll be stuck in The Green Rooms.

Abilities

 * XLL can transform into his Beta Luigi appearance for a limited amount of time.
 * He can see in the dark.
 * XLL will make you have the same appearance as his, being a jumbled mess of code and turn into a hollow husk if touched. XLL has no control over this ablitiy.
 * He can regenerate or grow limbs if needed.

Weaknesses

 * He can only see in shades of green. He can see the color red perfectly fine though.
 * XLL's body is extremely skinny and frail. If struck by a heavy blow, it would deal big damage to him.

Trivia

 * The Green Rooms are inspired by the famous Backrooms.