Stick Buddy is an inanimate object that only appears briefly in the episode "Bubble Buddy."
It is a normal twig that is taller than SpongeBob.
Role in episode
SpongeBob is bored and has nobody to play with, so he decides to make a new friend. He starts out with Stick Buddy, but drops it on the ground. He then tries Rock Buddy and Sink Buddy, both of which do not do anything. He lastly creates Bubble Buddy.