The following profiles are related to Rin's friends/classmates (they're somehow reductive compared to the others because these characters are really secondary)

makidera kaede

 name: Makidera Kaede
 age: 16 years old
 nationality: Japanese
 profession: student
 personality: Kaede is one of Rin's classmates and best friends, also known as  the Black Leopard.
 She's energetic, she likes competition and she tries to lead the members of the trio.  She can't really stand failures and she doesn't really tolerate people who notices  her lacknesses; she's not that brilliant tough and her marks at school are just pathetic.

Himuro Kane

 name: Himuro Kane
 age: unknown
 age: 16 years old
 nationality: Japanese
 profession: student
 personality: Kane is the second member of the trio. She seems to be the one  with most brain, she's quiet and reserved and she doesn't speak that much as well.  She's Minori's best friend and she has an insane passion for gossip (especially if it's  something that is involving people she knows).

Saegusa Yukika

 name: Saegusa Yukika
 age: unknown
 age: 15 years old
 nationality: Japanese
 profession: student
 personality: the youngest member of the trio. Yukika is a shy girl, the one that  probably respects and worships Rin the most. She's very affectionated to her  youngest brothers and she spends lots of her free time in looking after them.