She is one of the best, KyoAni handled her character really well and she was by far the most interesting part of that series. My close second would be Aya, she's adorable and I really appreciate that she is a canon lesbian character in a moe SoL which are notorious for being filled with yuribait, and she is a main character and not treated as just a joke.
I haven't watched the series but apparently there are more:
Am I the only person who thinks that scene was poorly animated. I mean it's like they're just sliding across the screen.
It's pretty adorable how awkward she is.
it was meant to be
What do you mean by "these characters"?
Dark haired lesbians who are in love with oblivious mahou shoujo MCs who consider them their best friends?
Is Tomoyo from CCS the first one or is there an older example of such a character?