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@taddybearlove
Both concepts sound hilarious, but interesting too.
Courage working for I.M.P. sounds like it would be a disaster, and I mean this in an entertaining way. (The poor puppy is too pure to cause harm or be in Hell). In a way, I more likely see I.M.P. starting out with disliking Courage. Like, if they were hired to kill his owners and Courage manages to successfully protect them. But I.M.P. doesn't kill him as well because... come on, Courage is too precious to kill. So they just skip out on this target... for now.
As for Tom & Jerry in Hazbin, I can actually see Tom being an Overlord but he ends up losing respect because Jerry keeps making a fool out of him (Classic Tom & Jerry). I also see Jerry being a staff member at the hotel and while he's nice to everyone else, he is purposely annoying to Tom, which would be funny. (On a side note, Tom & Jerry being in Hell doesn't surprise me).
But those are just my thoughts. You can write them in your way if you want. They sound like they would be fun concepts to work with.