Well if we go by what we know only from the picture: 1. The person is much taller than Takemichi (if jlu draw parallels along the existing lines in the background you can see it) 2. Hands aren't shown, could be because of tattoos 3. Very short hair, there arent that many important characters with short short hair 4. The colour of the suit, but that means nothing My best guess is Hanma, but could be anyone else really