No gender character? Is there one in Black clover?

I vaguely remember a character with a long black hair in a ponytail who has a crush(?) on the male protagonist but is having this situation where he(?) tried to fight his feelings because he wants to be a man or something?


I think the person can choose their gender at a certain age. There is also a scene where that person decided to dress up as a girl but it didn't go anywhere (based on my memory)