Vile
From Multiversal Omnipedia
Vile was a persistent foe of X and Zero, a Maverick who has repeatedly aligned himself with Sigma's plans. Despite being destroyed several times by both Maverick Hunters, he always returned, seeking revenge.
Comments
Vile is loosely based- at least in appearance- on Star Wars fan favorite character Boba Fett. This is more obvious in Japan, where his name is Vava- a variation on "Boba."