Places someone might find the character? Things they might be doing? EVERYWHERE. Shiki is always out walking somewhere in canon, day or night. Places she tends to frequent more would be the dojo, and near the club area, but rarely in it.
Is the character in any IC group, including the school? Details! D-defence force, lol.
What kind of person does the character get along with? The thing is, she has no vested/ strong interest in people. She tolerates pretty much anybody, though people that fool around/ tease too much will end up with a knife stuck in them. If you're abnormal, she'll be ping'd.
Is there any type of CR you feel the character is missing (e.g. romantic interests, mentor figures, etc)? I think she's pretty good, since she can't really get deep CR. No one can take the place of Kokuto, so there's no hope of a Morality Chain here.
Other notes? Even if hangs around with you, she still wants to kill you all 8(