My Keycool 87 II came with the superhero caps, btw the R is Robin
I know some think it looks like the Keycool k
Different keycool boards do have different accessories, the rainbow came with an extra red ESC Key, Purple WASD keys and Blue Arrow Keys, with keypuller and those slidy in key isolators, extra stabilizer components too if I remember correctly (gave it as a Christmas present)
anyway great keyboards, especially if you are as tight with your dosh as me