Flywheel is the second oldest sibling behind Kilroy himself; and is an identical twin to his idiot brother, Luke the Spook. Although identical in shape; Flywheel is a different color and is a good person. While Luke the Spook is a light grey; Flywheel is an ocean blue color; earning him the nickname; "Sea Kilroy". He is an aquarium enthusiast; and has traveled around the world; visiting their aquariums and rating them. Because of this; he has earned a second nickname; "Aquarium Kilroy". Out of Luke the Spook; Flywheel and Overby; Flywheel has the longest antenna of them all.
After Luke the Spook began his life of crime; the twins seperated. Flywheel took interest in aquariums and oceanariums; and began documenting them; traveling worldwide to see them all. Today he still visits his no.1 ranked aquarium; the KoopaTown Aquarium . Luke the Spook damaged the Mount Kilroy Aquarium during his 12th escape; but it has since been repaired!
Flywheel left his mark on a display tank at the KoopaTown Aquarium.
Flywheel comforts the victims inside the KoopaTown Aquarium; where Luke the Spook locked the victims up during his rampage through the aquarium. Friendly Smoes armed with M9 Bazookas stand guard to protect Flywheel and the victims in case Luke the Spook comes back.