John Doe is extremely obsessive and determined to win over You's heart, to the point where he won't accept rejection as an option. John has a peculiar and morbid way of demonstrating his desire, as seen when he stabs You and kisses their blood-soaked face in the second ending.
I am a simp for this man.
Here's how he looks while not being merged with Welcome Home.
IDK MAN OKAY!?Now... Here is John merged with WH.
HE'S CUUUUTTTTEEEE