Pickaxe and Tennis Ball seem to be best friends since before Object Madness takes place This is shown in the start of the first episode where a picture of both characters is hanging on the wall.
Episodes suggesting a friendship
- Ep 1: Pickaxe greets Tennis Ball after he and five other people were poured from the bus door. Earlier in the episode, you can actually see there is a picture of Tennis Ball and Pickaxe in Puffball's house, seen a few times.
Episodes suggesting a conflict
- Ep 1: At the end of the episode, Pickaxe calls Team B, the team Tennis Ball was on, the "loser team."