Small Fox

This cute little fox works with his dad at the mysterious oden stand. He's shy, but he'll stand up for his friends. Watanuki gave him one of Doumeki's broken arrows, the Arrow of Virtue. and in exchange he saved his life in a parade. In the anime, he collected special objects and played shiritori with Watanuki and Mokona. Appearently, the night stand and the foxes cannot be seen by regular people but since Watanuki can see spirits, he can see them too. Chibi also collects special and rare items that he keeps in his drawer.

(Source: xxxholic Wikia)