“Pawns need no sense of self! It's only natural to sacrifice soldiers for victory in war!”
—Izuka
Izuka (イズカ, Izca in the Japanese version) was the advisor of Pelleas, as he led Daein to independence. He was one of the major antagonists of the game, manipulating Pelleas to think he is Ashnard'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. He is the boss of Chapter 5 in Part IV of Radiant Dawn. He drops Balberith when defeated, but he can summon four enemy laguz per turn and uses the Rewarp staff to avoid enemy units making defeating him difficult.
It is also worth note that he is the only Summoner in the game, and, in fact, the only default summoner in the entire series to date.
Izuka's English/PAL name is apparently taken from the name of graphic designer Daisuke Izuka. who's name appears in the credits of Fire Emblem: Radiant Dawn.