Luigi

Luigi is the sidekick and younger brother of Mario, the leading protagonist of the Mario series. Like his brother, he is an Italian Plumber who resides in the Mushroom Kindgom where he is known as a hero and protector.

Super Mario World 2: Yoshi's Island
The events of Luigi's birth by him and his slightly older brother Mario being delivered to their parents by the Stork. Kamek foresees that the two children will interfere with the Koopa Troop's plan of world domination in the future and attacks the stork to kidnap the kids to prevent them from stopping them in the future but Mario ended up landing on Yoshi's Island instead while Luigi remained kidnapped. Mario and Yoshi end up rescuing Luigi after defeating Kamek and his master, the young baby Bowser.

Wrecking Crew
Luigi and Mario were both demolish workers during Wrecking Crew on their time in New Donk City.

Mario Bros.
Both Luigi and his brother Mario became plumbers and started the Mario Brothers Plumbing company. One of their jobs was cleaning out a sewer of many strange creatures that were coming out of them.

Super Mario Bros.
After cleaning out the sewers of the strange creatures, Luigi and Mario ended up finding a pipe that lead them into a different world. They made there way into the Mushroom Kingdom during the time it was being taken over by Bowser who had kidnapped Princess Peach and had the Mushroom Retainers taken in different fortresses in the kingdom. Mario and Luigi ended up saving them after defeating Bowser and restoring the land. At this point Mario and Luigi decided to stay in the Mushroom Kingdom as they were considered heroes there.