Mr. X

Mr. X is a B.O.W. in the Resident Evil series made by Umbrella during the late 90's dispatched to kill everyone in Raccoon City. Expectable, honestly. What was unexpected was for him to join the ring and end up body-slamming everyone with no true goal, even going against Albert Wesker at some points.

He's Gonna Give It To Ya
Sminem worked for a small amount of time on Umbrella Corp. personally creating the Tyrant model T-00 himself. However, after he left, Umbrella wasn't able to replicate his genius genetics, and just made clones of it.

Season 1
Mr. X somehow appeared in TFR for unknown reasons, and made himself a formidable wrestler.

Episode 1
During the Sperm Case Wars, Sminem reactivated Mr. X's biological conditioning to be loyal to him, and used him to do his bidding.

He attacked Leon and Chris while they were arguing, so they had to team up to defeat him.

Episode 2
It was revealed Sminem instructed Mr. X the week prior to distract Leon and Chris to obtain The Case.

Episode 4
He attacked Leon and Chris again when they didn't expect it and defeated them.

Episode 5-7
His jobbings made him unoperational and unable to combat in the finale for Sminem.

Episode 4
He was reactivated to combat the U.S.S. sent by Umbrella along the two Gachis.

Episode 8.5
He had to fight Jacket, but was unable to go against his murderous-ness.

Episode 12
He had a last match in the Royal Rumble before being deactivated again.

Season 4
After a whole season, Mr. X was finally reactivated again, along with Mrs. X, to participate in the Mixed Tag Tournament.

Episode 3
However, they were defeated by a team way too strong for even a B.O.W. to handle.

Episode 5
Kojima scheduled a match against Drake Bell, and if any of them lost they would suffer consequences—And it happened, because his support, Mrs. X's, eye fell out.

Season 5
Somehow ended up trapped in the in Universe 2K20 by La Parka.

Episode 1
He was selected for the non-candidate where the first 10 eliminated  and the winner and highest killer wins .

Feats

 * Gave it to us.