I’m a [name_u]Maria[/name_u], and I never really had a nickname, as [name_u]Maria[/name_u] was short enough! Occasionally, close family called me “Ria”.
I’m starting to really like Marie especially since it has a history for my family. I think MiMi would be like a “family” nickname. I don’t see it being used by friends or teachers.
I think my favorites across the board are Mae and Ree.