Izuka

Izuka was the advisor of "Prince" Pelleas, as he led Daein to independence. He was one of the major-antangoinsts of the game, manipulating Pelleas to think he is Ashanrd's son, and to sign a blood pact with Lekain. He also created the elixir that turns laguz in to Feral Ones. He tried to feed the elixir to Muarim, who was saved by Rafiel shortly before he couldn't control his mind anymore. After this incident, Tormod refuses to see face-to-face with Izuka again. Izuka wields the most powerful dark tome in the game; Balberith.

Trivia
In Fire Emblem:Path of Radiance Izuka was the scholar in charge of the tower in chapter 28:Twisted Tower.