Like, I've warmed up to characters/series I didn't care for thanks to Smash before. Snake is a prime example of this - I only played Metal Gear Solid 1 back in the day, and never really got into the series. His inclusion in Brawl was like "Huh, ok...? Weird guest character pick." to me, though I could appreciate the box bit in the trailer.
But when Brawl came out and I got my hands onto Snake, he was really fun to play to me and ended up being one of my favourite Brawl newcomers based on that alone, to the point where I'm considering getting his amiibo, even though I don't care much for the character the moveset is attached to. I was genuinely hoping for some way for Sakurai to bring back the moveset even if they couldn't get the rights to Snake back lol.
Joker wasn't that case for me, and from what I've seen I doubt Hero or Banjo are going to be different, but who knows. I really enjoy Mementos, though. I'm sure the characters will play fine, and I don't fault anyone for being excited about Persona/DQ being in Smash, either.
I just wish those games weren't tied to such disgusting people who hate one of the minorities I belong to.