Mr.L

Mr. L is vengeful spirit luigi created by Mr. Pixel. He is main antagonist of Too late. exe and the upcoming Sequel The Forgiven.

Appearance
It is unknown how Luigi was before he died, but it can be assumed that he was once like his canon counterpart, nice, caring and noble. However, as Mr. L he is an evil and sadistic spirit who tortures others after his death simply to vent his frustration.

A notable trait that Luigi has is his hatred towards his older brother, Mario, for killing him and wants to make him pay. He does this by relentlessly torturing him throughout various levels created by him before ultimately killing him in the same area where he once died. It's unknown if Luigi was aware that Mario did not mean to kill him (as evidenced by him having a look of deep remorse and depression) or simply did not care.

Biography
Luigi was Mario's younger twin brother and they lived adventures together, however, several undisclosed events happened that led to Luigi's death when he fell into the lava.

Mario would spend his days tormented by what had happened at that moment until he was reunited with Luigi only to watch him warp into a monster and devour Mario's head. Despite having died, Mario would reappear where he would enter grotesque scenery while being haunted by the ghost of his brother.

Soon Luigi will tell his Mario to go to Bowser's castle to rescue the princess to finish torturing his brother, implying that he killed her. Mario will enter the castle where there are several Mr. L around him to then be thrown by the real Mr. L, Mario begs Luigi to forgive him before L throws him into the lava, ending the life of his brother. Mr. L then jumps onto the screen to tell the player that it's too late to save Mario.

Trivia

 * Originally it was stated by the director of Mario's Madness, Marco Antonio, that Mr. L would not be in the mod. However, this was done to make his appearance a surprise, which was ruined when his song was leaked on Twitter and the devs were forced to announce his reveal.
 * Luigi's nickname, Mr. L, originates from Super Paper Mario, where he was brainwashed by Nastia into becoming Count Bleck's minion and took on the title. Interestingly enough, both interpretations use the Mr. L alias when they were the antagonists.
 * However, Luigi is never addressed as Mr. L in Too Late.EXE.
 * Mr. L is similar to the Luigi from the "I HATE YOU" Creepypasta and ROM Hack. Both characters hold a murderous hatred for their older brother, Mario, and suffer from being dropped into a pool of lava in Bowser's Castle.
 * However, Mr. L is the more tragic literation, as he dies before the story takes place and it is afterwards that he wants revenge on Mario for killing him on accident. IHY Luigi, however, turns on his brother out of selfishness and jealousy and dies at the end of the story when Mario pushes him into the lava out of self defense (in the ROM hack, he purposefully knocks him into he lava out of anger). On top of that despite his death being horrific, it was not played for sympathy.
 * Despite his immense height, Mr. L is confirmed to be shorter than MX. Ironically, Luigi is depicted as being taller than Mario despite being the younger brother.