Board Thread:Questions and Answers/@comment-24830713-20141220200851/@comment-26010249-20141230071454

ICame2Play wrote: I believe that all of the Omnitrix aliens bring their own personality with them when Ben transforms (Atomix is more hammy, Grey Matter is naturally smart, Rath is a lot angrier) but to different degrees. It was only in Ghostfreak's case whenre the actual sentience took over. That's their nature. It's  the traits passed down through genes like how we inherit some of our parents' personality, although it's not a separate consciousness, it's just some of their traits. On Aliens case, it's the nature that the species have. like Galvans being smart and Rath having anger management.

Ghostfreak and Big Chill is an exception as Ghostfreak's whole personality is found on every strand of his DNA and BigChill having a separate consciousness that allowed Ben to reproduce as BigChill. There might be some Aliens that are true to this nature as well.