Punished "Venom" Rinku
Wait, what? I said they retract until the tattoo disappears, that way we can actively keep track of how much magic paint stuff is left.I don't think we ever said the tattoos would "shrink" or decrease in size that would be kind of weird. What the tattoo would do however, is stop glowing or disappear. And the wall power was supposed to be for only one character I think. Each character was supposed to have their own movement-based power.
And the only power there is is the power to merge into the wall as long as there's enough bodily produced paint left.