Stinkfly, a Lepidopterran, ties with Wildmutt for the least humanoid of all the Ben 10 aliens. However, Stinkfly has some advantages that make him far more useful.

Ben 10: Destroy All Aliens turns the clock back to 10-year-old Ben Tennyson, ... Along the way, they can also transform into favorite aliens like Grey Matter, Stinkfly, and Four Arms.