Elisa,
I'd go with the pretty little Nebula. She'd be fun to play to old age. She's adorable. I also like your mother Sissy, I haven't seen that cute little red ponytail before. When I can't make up my mind who gets to inherit, I usually choose the youngest so they will play longer - and have more time to have more kids lol.
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WARNING: I cannot be held responsible for the above as apparently my cat has learned how to type.