Katt because I imagine her as some sort of metal-obsessed girl who likes to practice on guitars but at the same time would be that type of friend irl who always helps you out.
That's exactly why I liked Katt as Uchi too =) Katt was my first Uchi and I adored her. But I let her go to experience new villagers.
Phoebe was my second Uchi and she really fits the personality, I loved her a lot too! But I adopted her out before I reset my town.
Fuchsia moved in my old town right before I reset, so I didn't get to know her much, but she was really sweet!
Cherry is my first Uchi from my new town, but I don't like her much.
Recently I've adopted Tammy and she really looks and feel like the tough older sister type to me, she's sweet. But haven't had her long enough yet to really make my opinion.
And yesterday, Pashmina moved in. She had been a camper twice in my last town, and both times I was full... I'm happy I could adopt her and she moved in now (on such a perfect location <3) and I hope to get to know her better in the next days!
Cannot really call a favorite yet ^_^