Maybe because of my artstyle, my character's body shape or faces are malleable to some degree (especially my story's protagonist) They can look cartoonic or more realistic based on the scene's mood & tone.

I always want my characters (mostly story characters) to have a specific 'look' that others don't (like in real life), so to tackle same-face syndrome. Personally I couldn't tell who's who even if their hair colors or skin colors changed (even wearing different outfits). If they share same face features I'll get confused XD
And also, I had a lot of triangle elements in my character design. Subconsciously I must be liking 