He’s a compulsive better who doesn’t seem to care much about the safety of anyone but himself, but seems to grow quickly to people. He thinks everyone has a good side to themselves and they should focus on what good they do instead of on what bad they do.

He has strong will and passion on whatever he set his mind on, even if he has to squash someone else to reach his goal."

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For Kouki, I imagine something kinda rough, but also sweet. Nothing too crazy but nothing too delicate, maybe more of the latter than the former. Don't be afraid to experiment!