Damn I must have shit luck to constanly run into Honeygast so often then. I didn't even know there were other bosses except it and Mitsuro. I also didn't know that the spawning of other enemies is tied to Honeygast and not just a thing that happens during bosses
Mirrim can be found in the Observatory, Funhouse and the Dilapidated Halls. Though in both she has a 1 in 256 chance to spawn. So be ready to face her. Idk if she can be fed or eaten though since she's the only one I can't play with in the Ghostiary yet despite eating and feeding every other ghost there