So, I'm revamping the Monster Lab section over on the wiki and realized something. Players can only have one copy of Lord Pumpseed, his cells can't be traded in Team Chat, and he can only be crafted and ranked with his own cells (no elementium or elemental cells). All of those restrictions are the exact same as the Forsakens (who didn't yet exist when Lord Pumpseed was released).

Y'all want to go ahead and recategorize Lord Pumpseed as a Forsaken?

Pumpseed was supposed to be a Halloween exclusive monster, which is dumb since there is going to most likely be a Mythic Halloween themed monster this year

He predates any Forsaken monsters. I think SP liked the idea and decided to make a special class around the idea. They just need to bring Pumpseed into the fold.