Board Thread:Questions and Answers/@comment-24830713-20141220200851/@comment-3974711-20141230025225

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.