Oc is a transfer student. Her name is Kinu Page or Karariin which has the same meaning- attendant. Kinu means silk. (At least that's what I read and what was on google translate)
My interpretation of Hara is a carefree teaser who can be quite serious but still playful when he likes something. Much like basketball where he still plays with seriousness yet he doesn't care about the rules, being lax with how he plays even with the dirty tricks.
Long explanation but I don't want someone coming by thinking, "He wouldn't do that!"