i have read that it is John next to Jesus. ok but why did leo make john look like a female? there is a difference between a feminine looking guy and a female, and that looks like a female.
What I never noticed until recently was that there is the top of a door underneath Jesus. (Which was actually built after the painting was completed). I didn't even know it was painted on a wall to be honest.
It's strange how your brain can miss something in plain sight simply because you don't expect to see it. Perhaps I'm just stupid though