|Main Weapon(s)||Yoshi's Powers|
Ihsoy is revealed to be an old enemy of Yoshi. Prince Boo accidentally releases him from the Golden Yoshi Egg, where he has been imprisoned inside for many years. Yoshi (along with the babies) must imprison him before he takes over Yoshi's Island.
Ihsoy once again appears in the Diaper Duty Series as one of the main villains. After being imprisoned in Yoshi's Island: Diaper Duty 11, Ihsoy gets freed by the Anderobots, who make him their leader. Soon Dry King Koopa comes and takes over the Anderobot clan, making Ihsoy his sidekick. At the end of the game, Ihsoy is turned into a Pineapple by Kamek by accident and is eaten by Yoshi.
- Ihsoy's name is Yoshi spelled backwards.