Stick Buddy is an inanimate object that is only briefly seen 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 and 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 didn't do anything. He then creates Bubble Buddy.