Episodes suggesting a friendship
In A Kick in the Right Direction, Paintbrush thanks Fan for saving the ball.
In Kick the Bucket , Fan apologizes to Paintbrush, ignoring Test Tube, who is trying to hand him a bucket. Paintbrush accepts Fan's apology, and he empties the bucket into the tank, lifting them closer to the key.
Episodes suggesting a conflict
In Everything's A-OJ, Paintbrush and Fan have several arguments about how much work needed to be put in to win the challenge.