>>3471338>What is something your waifu can do that she is proud of for being able to do?
She is proud of her kenpo skills and combat prowess. She definitely likes to receive compliments for her fighting performance. Same goes for the high ranking her team manages to receive later on.>Is it the only thing she's good at?
No but considering she spends most of her time polishing her skills it makes sense for that to be the thing she is most proud of. Especially when you take into account all the discipline it takes.>Also, who is her friendly rival in her story?
Most of her friends can be friendly rivals in some sense depending on the circumstances. There was some animosity between her and Koito in the anime adaptation, and they have some friendly competitions later on. Haruhiko to some extent as well. She doesn't like it when her friends get too ahead of her in terms of abilities, which makes her want to try harder in turn.>Who is her worst enemy in her series?
Probably Ruupa. She wore her appearance and attacked an old friend of hers along with stealing her memories. Among other terrible things.
Though she eventually gets and sealed and the things she did get undone a chapter later. Though I don't think the alternate reality version of her comes close to atoning for what she did at the end of the second volume. Still, Mai doesn't really hold a grudge against her either.
Touko was also a really powerful and dangerous enemy who threatened the entire world but she doesn't get as personal as Ruupa.>>3471350
Mai likes competent people that can get the job done.>>3471397
Depends on the context and her mood, but usually she would say something like はい、お疲れさん or ご苦労さん which is a casual way of expressing your appreciation for someone who has done a good job. If I were to be late for an appointment or if she is in a sour mood she would probably start with ねえ、あんた・・・ before voicing her complaint.