Why are the BA girls so lovable?

Blue Archive has done something VERY few works can do. It made me love every single character and want more of every single character. Only one other series managed to get this sort of attachment from me.

You can legit point at any of the girls and go "That's my favorite" and I'd understand why. (Even the MOBS have a cult following, that's crazy). Granted I love some more than others, but I don't outright dislike any of them and still have an attachment to them.

You might as well just rant about your favorite character in the replies cause... chances are I'd probably read every single one-