Picka Bone is the son of Grace'l Ossein and Marrow Bones and brother of Joy'nt Bone. Unlike other skeletons, he can not come apart to make useful tools. He can remove his clavicle and play music on his ribs. He had to become the best musician in Xanth to take over Caprice Castle. In a battle of players, Picka played better than Piper. Once he bested Piper, he proved her was worthy to marry Dawn.
Picka was a major character in Well-Tempered Clavicle.