Dracula probably.
Everything from TMNT to MLP has had a Ghostbusters tie-in. Literally all that you have to do is put a character in a Ghostbusters uniform and, boom, instant crossover.
https://gamefaqs.gamespot.com/a/forum/9/94dd1b4b.jpg
Hey, look. The Icee Polar Bear is a Ghostbuster now.
...not even close
I thought this was a "cross the streams" related topic...
It might be Scooby Doo as they had a series back in the 70s that was nothing but crossovers.