Baby Luigi is the young form of Luigi. His first game was a prequel to the Mario games, Super Mario World 2: Yoshi's Island where Kamek stole Baby Luigi, but missed Mario. When Yoshi caught Baby Mario, the two of them went out to rescue Baby Luigi and bring the two of them to their parents.
In Mario Kart: Double Dash‼, Baby Luigi, along with Baby Mario appeared as a playable character. They are in the Light category, and their Karts are buggies. Their exclusive item is a Chain Chomp which allows them to go faster, plus ram through other racers as well.
Baby Luigi's most notable appearance is most likely Mario & Luigi: Partners in Time where Baby Mario and Baby Luigi, along with their older selves, were playable characters. They met up with their older selves while Mario and Luigi went through time to save Princess Peach.
Super Nintendo Entertainment System
Game Boy Advance
|Babies in the Super Mario Series|
|Baby Mario | Baby Luigi | Baby Peach | Baby Yoshi | Baby Bowser | Baby Donkey Kong | Baby Wario | Baby Daisy|
|Major allies||Princess Daisy • Baby Mario • Baby Luigi • Toadsworth • Professor E. Gadd • Rosalina • Diddy Kong • Captain Toad • Toadette • Raphael the Raven • Baby Peach • Polari • Prince Peasley • Stuffwell • Starlow • Geno • Mallow • Lubba • Goombario • Kooper • Bombette • Parakarry • Bow • Watt • Sushie • Lakilester • Goombella • Koops • Flurrie • Yoshi Kid • Vivian • Admiral Bobbery • Ms. Mowz • Tippi • Twink • Professor Frankly • Merlon • Kersti • Huey • Cappy • Rabbid Peach • Rabbid Luigi • Rabbid Mario • Rabbid Yoshi • Beep-0|
|Minor allies||Bob-omb Buddy • Cragnon • Dolphin • Luma • Noki • Pianta • Puni • Toad|
|Main characters||Mario • Luigi • Princess Peach • Toad • Yoshi • Paper Mario|
|Supporting characters||Dr. Mario • Princess Daisy • Rosalina • Donkey Kong • Diddy Kong • Pauline • Professor E. Gadd • Toadette • Toadsworth • Captain Toad • Birdo • Nabbit • Cappy|
|Enemies||Bowser • Bowser Jr. • Koopalings (Larry Koopa / Morton Koopa Jr. / Lemmy Koopa / Wendy O. Koopa / Iggy Koopa / Roy Koopa / Ludwig von Koopa) • Wario • Waluigi • Fawful • Kammy Koopa • Dimentio • Antasma • Kamek • King Boo • Petey Piranha • Tatanga • Wart • Foreman Spike|