User blog comment:Soulreaper1234/Urahara says Fusion Aizen says Subdue/@comment-1932702-20100510095910

I DO NOT like Aizen's new form. He looked too snotty anyway and the smug expression on his face was the worst part of it. But now he looks like even worse!! It's like Zetsu from Naruto combined with Hollowification. Anyways, as to the wording, I'd go with Fusion, it's more apt in this case. Personally I'd go with something like a merger or symbiosis or something. But then again, those aren't far from fusion. So fusion it is.