Let's see... Your characters are mostly (regular) humans or demons! You have a pretty dark and mature aesthetic, both art-wise (ie. your use of muted colours, black shadows, realistic adult faces...) and bio-wise ( your OCs' bios often deal with adult/darker themes such as cannibalism, death, economic depression, street gangs, etc.)! Your characters seem very detailed, especially the ones in your "Main" folder. They have long backstories, and you specify some details that aren't seen that often here on TH, like their dominant hand, complete birth date, religious affiliations, and eyesight! Seriously, I think it's the first time I see OCs with canon, specific eyesights. It's very interesting in my opinion, and shows that you must spend a lot of time thinking about every little detail!