>>712736651
Nakajima is a reincarnation, his supernatural spirit affecting his physical as he realizes himself is part of the process, and he still behaves masculine.

Jung Mian is just a soft, pretty boy, being the knowledge of a demon has nothing to do with anything given Dazai doesn't look like Sephiroth.
This isn't to say a unique protagonist appearance is forbidden, but with the taller, protective older man bond it was clearly done in V to service a particular kind of fan.