Don't know if this will be universal with all villain toys, but the Boomtower figure (the apparent adaptation name for Tankjo) also has a "RyuSoul" Key accessory!

https://toy-wizards.com/2021/01/01/p...available-now/

At first I thought Hasbro was cutting costs on the keys by using a base mold and only changing the stickers, but pink and blue both have unique sculpts for their keys

I really wonder how they'll make the RyusoulKen though. No doubt it will be Nerf, but how would it make all the unique sounds of the powerup keys? (if they even decide to give each key their own sound)

this explains why the keys look so cheap, they need to make them fit a bunch of monsters too