I would believe any combination at all would result in something different, wouldn't it? The already subtle differences in a person would be more pronounced when combined and amplified by differing or similar traits of another, and there is no way to properly predict how two personalities would merge. There is an endless combination of new personalities you could get from the occupants here.

[He actually sort of understood that. Plus, well, even if it's not a personality-merge, he has a bit of experience on how combining people can affect their thoughts.]