Yeah, as le potate said, demon-behind-her Clara gets my vote. The last one is really cool too, but the demon one matches my mental image of her.

"Playful" old Mephisto is my vote there. Running from IRS is my second choice.

I like the man of action King, seems to match the energetic vibe I get from him.

And I have no real opinion on Alto. I feel like in my mind Clara was always blonde, and Alto being light based makes blond make sense for him as well... but then we have overlap. I hate overlap. Personal pet peeve. Sure other characters can be blond, but two leaders? TOO MUCH OVERLAP! REEEEE! But the other options don't fit in my mind, so sure, blond. Personal favorite for you it is.

So hey, me and the potato agree on at least two of them?