King Bucko Bigbones was a mountain hare and self-appointed King. He ruled over a court in the North-East part of Mossflower. Bucko was very bigheaded as he boasted a lot; he was taller than most hares and strongly built. He issued a challenge to any passing creature, to challenge him for his crown in three events: Bragging, Feasting, and Fighting. Towards the end of his reign as "King," Bucko had been growing lazy, developing a noticeable paunch that was repeatedly abused by Dotti in the Fighting Challenge.

Bucko joined Dotti and Lord Brocktree on his quest to liberate Salamandastron from Ungatt Trunn. As it turned out, Bucko had a score to settle with Trunn's Captain-in-Chief, Karangool.

After the mountain was retaken, Bucko returned to his home, along with his mountain hares, even though he promised Dotti he would serve as leader of the northern part of the Long Patrol with the title "General Bucko".