Marvin

Marvin is the counterpart of Luigi. He is the childhood friend of Varun. Marvin will make his debut in Super Mario Bros. X: Alternate Kingdom, where he befriends Mario and Luigi.

Background
Several years ago, Marvin was the childhood friend of Varun and Doshi whom he grow up with. Unfortunately, Marvin had to go back home to the Eleanor Kingdom, at the day King Varun was about to become a Mushroom King.

Invasion of Sea Side
Marvin is set to appear in Invasion of Sea Side as a pseudo-antagonist of the game. Several years later after Marvin returned back to his homeland, he returned to Sea Side to meet his best friend again, but Varun and Doshi had forgotten him.

Background
Years prior the events of Alternate Kingdom, it was revealed that Marvin had became the hero of Eleanor Kingdom, along with Varun and Doshi. The three of them had saved the Eleanor Kingdom and Princess Apple from Blaize, an evil Koopa who haunted them during their childhood. Years later, Marvin alone returned to Eleanor Kingdom, when the kingdom was already in danger by Blaize and his army. Marvin was unable to defeat them and got away from them, searching for Princess Apple and Doshi who was revealed to be in the kingdom trying to save the princess.

The Mario Bros.
Marvin was searching for the princess, just until he encountered Mario, Toad and Luigi. Asking for their help, the heroes accpeted his request to help him save the kingdom.

Princess Apple
Marvin had grew up with Princess Apple since they were kids. He used to be Apple's favorite playmate. They became childhood friends. However, these two had hard time just being close friends and had confessed their romantic feelings towards one another, becoming lovers.

King Varun
These two are childhood friends, but had been seperated from each other several years ago when they just became adults. Marvin always had Varun in his thought while Varun's memories of his childhood with Marvin slowly vanished, also forgetting the promise they made.

Mario
Marvin views Mario as a carying a sweet older brother (despite that Marvin is older than him), also reminding him of Varun. Mario had briefly met Marvin long ago as he implyied. In Alternate Kingdom, Mario came to Marvin's resuce and assited him on his quest to save Princess Marina from Blaize and free the kingdom from its perilous state.