Seyyerin Itoklo was a Jedi Knight, part of the New Jedi Order from Luke Skywalker's Jedi Academy on Yavin IV. An Etti, a near-human species from Etti IV, Seyyerin fell victim to the Yuuzhan Vong Warmaster's, Tsavong Lah, order that any planets that turned over Jedi Knights to the Vong would be spared, and any that harbored or hid Jedi Knights would suffer the consequences.

Seyyerin eventually fell before the Yuuzhan Vong and became one with the Force. Seyyerin was named by Jedi Master Kyp Durron in a reading of fallen Knights at a meeting of the Jedi Knights on Yavin IV to discuss the differing points of view on how the situation with the Vong should be handled by the Jedi.