Crystal

In the anime, the Crystal Saint (unknow name) was the sensei of Hyoga and Isaac, and pupil of Aquarius Camus. He is a protector of the Kohoutek Village's citzens. But, Gigas, a servant of Gemini Saga, dominated Kohoute and enslaved its citzens, to build a Ice Pyramid, for the pope forgive him of his fails.



Brainwash
Crystal could not kill the enslaver, because they are servants of pope. So, Crystal went reclaim with the pope, but he brainwashed his mind. Crystal come back to Kohoutek and aid to enslave the slavers, that he one time want save.

Hyoga goes to Kohoutek and fights with the servants of the pope and find Crystal. They fights between then, and Hyoga win, killing your own sensei.

Personality
According Camus, Crystal was amiable, sentimental. Crystal was as sapient as all the other sensei.