Even with the volatile nature of human growth around his age taken into consideration, this sinner seems to get particularly startled or frown when spoken to. He isn't used to real combat at the moment, meaning that he may struggle to keep himself together at the sight of something as mild as spilt innards at first.

He's considered as a femboy.

Sinclair is a 164cm male.

He has trauma with Kromer.

He is not afraid of death because Dante can always revive him.