Smolderin' Stu is a Strollin' Stu on fire that first appeared in Super Mario Sunshine as enemies. To defeat you had to squirt water on them to put out there fires. Then you can either stomp on them or push them on the walls by using squirting them with F.L.U.D.D's water. They reappear as enemies in New Super Mario Sunshine and can be defeated in the same ways. They also make an appearance in Super Mario World: Wii.