ruby’s my personal favourite of the 3, but i would choose carmen as i think she’d fit in alongside your other villagers the best, especially sasha, fuchsia, lily and marshal! i don’t know, she just has the same vibe as your other villagers do, and ruby and dotty kinda don’t. plus, she’s ridiculously underrated imo lol. either 3 would make a great new addition to your island, though.