utatane piko, gumi, oliver, flower, fukase, id say these are the basics… i suggest knowing at least all the v2’s, um.. yea!!! for utaus, i suggest the vipperloids and utau girls. very important to the fandom!
She doesn´t have a very big fanbase, but IA! She´s from a project called Aria On The Planetes along with ONE. I just really like her design and one of my favorite producers Jin uses her a lot in his songs!