The cartoon studio went under before Bendy could make any lasting imprint on the cartoon world.Joey's "lie" was telling Bendy that he would be adored or become human. No wonder he squashed Sammy - he thought Sammy had destroyed his other half! If Bendy was created from footage of Henry - the names are even similar, after all - then he may be trying to merge with him in order to stabilize himself, similar to what Alice Angel is doing with the innards of a legion of Boris-es. Koko was rotoscoped from footage of Max Fleischer's brother, Dave Fleischer, in a clown suit.
Bendy wants revenge because he was mistreated by Joey.Fleischer Studios, the company that created Betty Boop, had a series of shorts called "Out of the Inkwell" wherein a character named Koko the Clown interacts with the real world.