Places someone might find the character? Things they might be doing? Sector 4, near the beach since right now he's working on building his shiphive in one of the huge residences (I'll have to do a post about that at some point). You'll also find him bothering Cain at almost any moment looking for sandwiches to be made for him. So... Yeah, occasionally he'll be at the shelter near the kitchens, though in general he really could be just about anywhere.
Is the character in any IC group, including the school? Details! Yeah, he's one of those trolls seen just about everywhere now, he's also in Cain's swordsmanship class and hasn't missed one, yet. So anyone who has been to those would more or less have seen him at least interacting with Cain in them.
What kind of person does the character get along with? ... Anyone not human unless you're Cain, though you get double the points if you're not a land dweller, but that seems pretty rare in Marina (Even though they are all in an under water prison, oh boy).
Is there any type of CR you feel the character is missing (e.g. romantic interests, mentor figures, etc)? WHERE IS ALL THE HATE? I'm not playing him right am I? He needs to get out and make more land dwellers pissed the fuck off at him... Last week I would have added 'been more dangerous towards others' but the whole genocide the Japanese plot thanks to Euphie has fixed that. Now he's even on he watch list! Wait until Eridan finds this out he will think everyone is his kismesis now.
Other notes? I hate that he's 13, just sayin'. He acts at least 16, at most 18 (but that's a stretch) in canon so it's even more frustrating, FFFFUUUU- It sure doesn't stop him from killing land dwellers and attempting to fill his quadrants.