Afiko

Afiko was an airbender from the Southern Air Temple who betrayed his people and sold them out to the instigator of the Hundred Year War, Fire Lord Sozin, in 0 ASC. He aided the soldiers in the horrific Air Nomad Genocide; however, in 5 ASC, he was killed by the Fire Lord for "treason".

A bitter jealousy
Born in the Southern Air Temple, Afiko was seemingly normal growing up, but he grew jealous when Aang's identity as the Avatar was announced. Envious, Afiko betrayed his people by revealing the temple's location to the Fire Nation.

Traitor
Fire Nation soldiers stormed the temple and slaughtered the other monks, but they were too late to catch Aang, who had run away from home shortly before the assault. Afiko was instrumental in engineering the genocide of his fellow Air Nomads, earning a place as Fire Lord Sozin's close adviser. He also seemed to have aided Sozin in attacking the Earth Kingdom, in that he is often shown blocking or dispersing earthbending attacks and attacking earthbenders. The traitorous monk died long before Aang's return and the subsequent undermining of all Afiko's work. In the end, despite his loyalty to the Fire Nation and his achievements, historical records indicate that Afiko met his demise in the war's fifth year, as Fire Lord Sozin had him executed as a traitor for unknown reasons.

Known appearances in cards
Mönch Afiko Afiko