Sea Koopas appear in Super Fantendo Island Survival. They are essentially Koopa Troopas and Sea Turtles combined. They appear in the river in the middle of the island and in the ocean around the island. Characters can jump on their backs to use as platforms.
Famous Sea koopas
Implis is a well known Sea Koopa. But he is not a fuse between Koopa and sea turtle. He seems to be a Koopa but with fins and with barely seen marks on his shell.