Amnael

Amnael is a villain from the first season of Yu-Gi-Oh! GX. He is the seventh of the Shadow Riders, and therefore the last one.

Shadow Rider
Amnael beats Alexis Rhodes and Chazz Princeton easily, and he then takes Atticus Rhodes as a hostage. He then challenges the last keykeeper: Jaden. The duel starts and Jaden is keeping up pretty well, however, it is then revealed that Amnael is actually his teacher, professor Lyman Banner. Amnael explains that his body was damaged in an experiment, slowly falling apart. He then made a new body through alchemy. The duel continues and Amnael is beating Jaden, but the latter one manages to win the duel. Amnael explains to him, that he became a Shadow Rider to keep an eye on the other Shadow Riders, so he would know what they were planning. He then gives his Shadow Charm, the Emerald Tablet, to Jaden. Then his body falls apart into dust, along with Banner's original body. His spirit survives but gets eaten by his pet cat, Pharaoh. During the series, there are a few moments in which the spirit leaves the cat and gives advise. Amnael wields an "Alchemy" deck.