Koshi is a robotic yoshi-koopa hybrid. His father, Ishnok the Yoshi, and his mother, Paralene the paratroopa. During the events of Super Paper Bros. he was kidnapped by Count Dorian. Dorian kidnaps him because he was one of the Legendary Seven Yoshi Kids. His home island of Yossy Island was invaded by Lord Kala. Mario & Company saved the island and the Legendary Seven Yoshi Kids. Thus Paralene and Ishnok were eternally grateful to Mario.
- His name is derived from "Yoshi" and "Koopa".
|Super Paper Bros. Partners|
|Gaz | Jumbo Kong | Lord Boo | Krystal | Kommando | Bomberry | Kopa | Iron Byron | Chomper | Ko Pianta | Izzy | Trust E. | Missile Mike | | Krush | Curtis | Spike | Yoster | Timmi | Flamey | Gash | Whompo | Koshi | Darjeeling | Montana|