My favourite character would be Hirato (he's the boss... literally). Followed by Nai (I want a pet like that) and Kiichi (because of her design).
Least favourites are: Yogi (every time he's on screen I want to facewall to oblivion) and Karoku
I voted for Yogi. It was a tough choice cause i like Tsukumo, Hirato, Tsuchitachi alot as well.
Worst character is Erishuka for sure.
She's useless, annoying, selfish and spoiled. There's only romance in her head when there are more important things happening around her.
Favorite character is definitely Gareki. One step after him comes Yogi. They're both cute ;-; I like how tsundere Gareki gets when it comes to Yogi, LOL.
As for characters I dislike, I really get annoyed by Erisyuka and Tsubame. I don't like them and I think they're absolutely unnecessary characters.