Tiger Spirits are one of the most important chasters in the tai chi chasers series. They are used to detect Tai Chi Characters and fly airships. Most of them are yellow, but one is white. There is likely something special about white tiger spirits, but so far, they are just a differant color. Then again, the only white tiger spirit shown so far is Hak, one of the secondary main characters, so it may just be to signify that it's Hak and not someone else.