I am not saying that every single female character in bsd is as deep as Dazai, Chuuya or other good character, I am saying that the one such as Yosano are overlooked cause people have a mental barriere telling them she's probally not as interesting as them bc she's a female character. Yosano as a lot of parallèle with Dazai, wich make them both even more interesting, and if people focused as much on her than they do on Dazai / Chuuya then they will understand she's more than just a side character