Guess there's a lot that would make fun merch as the series continues, action figures and definitely something superpowered saliva related but for now:
Xun's tank top
would make a cool RL top, there can even be a female variation too Mister & Mistress Zexi XD
Crimson Panda Mask (red panda)
The Crimson Panda hasn't shown up in series yet but he's a wrestling superstar in series, so his mask appears in stores n such. His og mask gets destroyed and he takes a replacement from a store shelf.
So mayb in RL his mask could be a merch thing too