Thorax

King Thorax, or simply referred to as Thorax, is a male changeling who appears briefly at the end of season 6´s episode The Crystalling - Part 2.

Personality
Unlike other changelings, Thorax is demonstrably amiable and considerate with a sincere yearning for friendship. However, prior to meeting Spike, he bears much doubt that anyone could ever want to be friends with a changeling.

Relatives

 * Pharynx (brother)