Mr. Walters

'''"And I was stuck on a teacher's salary, bro. Couldn't barely pay my alimony."

- Mr. Walters  Mr. Walters, also known as  Coach Walters', is the hidden main antagonist of 21 Jump Street''.

He is portrayed by Rob Riggle, who also voiced Aloysius O'Hare from The Lorax.

Biography
Mr. Walters is a gym coach at a high school where a synthetic drug known only as H.F.S. has been bought and sold to countless teenagers and students.

He first met Jenko and Schmidt under drugs, and talked to them. Walters immediately showed strong hostility towards the two. After Eric forced them to take the H.F.S. Jenko and Schmidt were unable to concentrate on him threatening to send them to the principal's office should they not run the tracks, as they started hallucinating he was a fox puppet figure and then an ice cream cone.

Mr. Walters was actually a drug supplier at the high school; he has the popular environmentalist Eric Molson as the leader of his drug trade under his influence, and is in cahoots with Domingo and his gang, until he betrayed them by stealing the money, driving off with Eric and a drunken Molly (who he chose to use as a hostage) in a limo. Jenko and Schmidt took chase and stopped them.

While taking Molly hostage, Walters was shooting at Schmidt, but Jenko jumps in front of Schmidt, saving his life and getting shot in the arm and his chest, which was protected by a bullet-proof vest in the process. In response, Schmidt shoots Mr. Walters in the groin, castrating him before being arrested (properly with his Miranda rights correctly read to him) and taken away.

In 22 Jump Street, Jenko and Schmidt visit Mr. Walters and Eric in prison, where Walters says that after being shot in the crotch, he now has a vagina. He also claims to be Eric's girlfriend, which Eric denies. In the post-credits scene, Walters whispers to Eric that "he's late", indicating that he may be pregnant with Eric's baby, much to the latter's horror.

Trivia

 * The Lorax and 21 Jump Street (both of which Riggle starred in) came out in 2012.
 * Mr. Walters might be gay, as he has a man-crush on Jenko and being Eric's prison wife.