From WiKirby, your independent source of Kirby knowledge.
Who? Paint is an unlockable item which appears in the Top Ride mode of Kirby Air Ride. It appears randomly during standard races, dropping onto the course. When touched by a racer, the item activates, causing all racers to become invisible and have their name markers removed for a brief moment. This is intended to confuse the players, who may become unable to determine where their racer is.
To unlock Who? Paint, players must collect a total of 500 items while playing Top Ride.
Who? Paint is activated as soon as the racer touches it, allowing that racer to immediately pick up another item afterwards.