The intentions of Mr. Bag are clearly and confirmed to be malicious, but if some actions are done right, it can be befriended, as of Trevor's tierlist. This is further solidified by a user who had not seen the previous images of the creature commented “for some reason i believe the face in it comes from a corpse, which serves as the host of the creature, and it kills ppl just to wrap itself around them”, to which Trevor says that he “nailed it!”. This directly tells us.