Kooper is a Koopa Troopa that decides to join Mario's party after he retrieves his shell for him in the game Paper Mario for the Nintendo 64. Kooper can do many attacks both in battles and out. The two moves Kooper can do when you get him are an attack where he shoots his shell at one enemy. His second attack is very similar but it attacks all of the enemy on the ground. Kooper can't attack enemies hanging on the ceiling or flying enemies. He has the ability to retrieve items by shooting his shell across gaps.
| Characters in Mario | |
|---|---|
| Major characters | The Mario Bros. (Mario • Luigi) • Princess Peach • Toad • Yoshi • Bowser • Bowser Jr. • Rosalina • Waluigi • Princess Daisy • Toadette • Birdo • Wario • Donkey Kong • Diddy Kong |
| Secondary characters | Wanda • Pauline • Professor E. Gadd • Toadsworth • Captain Toad • Nabbit • Cappy |
| Enemies | Koopalings (Larry Koopa / Morton Koopa Jr. / Lemmy Koopa / Wendy O. Koopa / Iggy Koopa / Roy Koopa / Ludwig von Koopa) • Fawful • Kammy Koopa • Dimentio • Antasma • Kamek • King Boo • Petey Piranha • Tatanga • Wart • Foreman Spike • Koopa Troopa • Dry Bones • Goomba • Piranha Plant • Boo |
| Other media | Giuseppe |