My theory on “Bendy” is that he is in fact a good character placed under hypnosis. When “Bendy” was created, he was a deformed, imperfect clone of bendy. This appearance, however, did not mean he was a bad guy. He was actually a nice person and honest just like how the cartoonish bendy was. However, possibly prior to the game, he was captured by an unknown group and was hypnotised into making him believe he was a deity and a saviour. When he met Henry in Chapter 1, he possibly believed Henry was an unbeliever, which caused him to be hostile towards him. The rituals and rooms made for worshipping “Bendy” was possibly made so “Bendy” would still believe that he was a deity. In Chapter 4, he noticeably acts more passive towards Henry, even up to the point where he killed the Projectionist to save Henry. This could mean that the hypnotic effects that caused “Bendy” to act like he did in all previous chapters wore off sometime between the end of Chapter 3 and the beginning of Chapter 4.
So that’s my theory. “Bendy” is a good guy placed under control by an unknown group. What do you think?