The Koopalings

The Koopalings are Koopas and a group of seven Koopa army generals under Bowser. They are his children. They are the most high-ranking in the Koopa Kingdom's army besides Bowser and his son, surpassing characters like Big Boo. In their appearances they serve as minibosses for the first seven castles in Super BackupCat World 2D and Super Mayro World.

Larry
5-5 - Super BackupCat World 2D: Larry's Seesaw Land

1-5 - Super Mayro World: Larry's Castle

Larry is seen directing the construction of the carnival.

Morton
2-5 - Super BackupCat World 2D: Morton's Cruel Castle

5-5 - Super Mayro World: Morton's Castle

Morton likes filling his castles with seas of lava. His powers are very fire-based. He is also usually seen in barren areas.

Iggy
6-5 - Super BackupCat World 2D: Iggy's Greenery Castle

4-5 - Super Mayro World: Iggy's Airship

Iggy owned a standard, yet overgrown castle, and then an arsenal of powerful airships.

Wendy
4-5 - Super BackupCat World 2D: Wendy's Billball Fortress

6-5 - Super Mayro World: Wendy's Castle

Wendy owns a very towerlike castle in SMW.

Lemmy
3-5 - Super BackupCat World 2D: Lemmy's Sand Castle

2-5 - Super Mayro World: Lemmy's Castle

Lemmy likes toys and his bouncy balls, and appears multiple times in Lemmy's Castle as an obstacle.

Roy
1-5 - Super BackupCat World 2D: Roy's Scuzzball Factory

3-5 - Super Mayro World: Roy's Castle

Roy has loads of cannons lining his castles, leading to heavy gunfire. His boss rooms also commonly look like an angry face.

Ludwig
7-5 - Super BackupCat World 2D: Ludwig's Changeup Dungeon

7-5 - Super Mayro World: Ludwig's Castle

Ludwig designs his castles in a puzzle-solving way, and also is a powerful magician. He can cause hallucinations in the player, similarly to the Toxic Mushrooms.

Besides these appearances, all the Koopalings also appear in a cameo in 8-5 of Super Mayro World, trapped in cages by Kamek. Only Roy can be fought, however, but only because of his digging/teleporting ability.