Baby Luigi is the one who has been kidnapped in Yoshi's Island DS and Super Mario World 2: Yoshi's Island. He is Luigi in his baby form. The Stork pecked a Toady to make it drop Baby Mario and Baby Peach. His brother is Baby Mario. In almost every Yoshi game he is in, he has been kidnapped by Kamek and his Toadies. Baby Mario must be taken to his younger brother so that they can be reunited. In Yoshi's New Island Baby Luigi is yet again kidnapped by Kamek and has to be rescued for the third time by Yoshi and Baby Mario.
Super Mario World 2:Yoshi Island (SNES & Gameboy)
Yoshi Touch & Go (Nintendo DS)
Yoshi Island DS (Nintendo DS)
Yoshi's New Island (Nintendo 3DS)
Mario Kart Double Dash! (Nintendo Gamecube)
Mario Kart Wii (Nintendo Wii)
Mario Kart 8 (Nintendo Wii U)