To'kustar: Way Big. Vilgax enjoys using this to smash through cities and to attract Ben to him.
Ectonurite: Ghostfreak. Vilgax calls his species by their species name.
Galvanic Mechamorph: Big name little nickname. Upgrade.
Transylian: Remember the Viktor dude who helped Ghostfreak? Yeah thats the guy.
Scleran: Eye Guy. With red eyes.
Celetialsapien: ALien X. Vilgax twisted it, it has all the powers, and is used to gather time to retreat.
Spheroid: He can spit acid. Though its red instead of green.
Vladat: A vampire bat humanoid creature from the same planet as Viktor.
Arburian Pelarota: A twisted Cannonbolt. This is usually used to match strength with Kenny.
Sonorosian: Echo Echo's twisted version. Vilgax uses this when they have to split up.
Hope youi like this. Vilgax is messed up in the head. Thats why he added this stuff. I am currently twisting the Versions into what Vilgax really turns into. Above is just the basis of them.