Mr. L

The Enigmatic Mr. L is one of the villains in Super Paper Mario. Mr. L is possibly the darker alter-ego of Mario's brother Luigi.

History
Mr. L does not have any history, as he was purposely kept a secret by Nintendo. Mr. has been seen to call himself the Green Thunder and controls a very massive robot called Brobot. Later on in the game, he upgrades his Brobot to the Brobot L-Type. After the loss to Mario, Dimentio drops in and "kills" him.

Trivia

 * For the longest time, Mr. L was thought to be Luigi until Nintendo came in and said that Mr. L might have been a creation of Count Bleck.
 * Mr. L's L on his hat is backwards much like Waluigi's but Waluigi's is not only backwards, but also upside-down.