While this trademark would allow Warner Bros. to use Big Chungus across a multitude of merchandise, it makes sense to use him as a MultiVersus fighter
It's a live service game, so there will be a steady stream of content added, and the popularity of Big Chungus currently outstrips many of WB's non-meme characters
Rick Sanchez, Stripe (Gremlins) and Black Adam are still on the slate for Season 1, so we likely won't get to see Big Chungus until Season 2 at the earliest