Lyon

Lyon is the main villian in Fire Emblem:The Sacred Stones.

The Prince of Grado, and son of Vigarde. A gentle person who greatly admires his close friends, Eirika and Ephraim. His greatest ambition was to be a strong ruler to protect his kingdom, fueled by his weak health, his onesided love for Eirika, his hidden jealousy of Ephraim and his feelings of uselessness. His experiments with the Fire Emblem, while noble in theory (he intended to save his father's life, and resurrect him when it didn't work), were the cause to the rise of the Demon King, as they finally drove him mad.

Lyon has long, purple-gray hair and wears very large robes that cover most of his body. His face is rather pale, and he has purple-gray eyes. When he's not fully domninated by the Demon King, Lyon's speech and behavior are different whether he talks to Ephraim or Eirika: when he faces Eirika he seems sad, remorseful and gentle, as well as somewhat willing to hear her; when he speaks to Ephraim, he's much more aggressive and straightforward, saying that despite cherishing his friendship with Ephraim, he wants to win a battle against him at least once.

Lyon first appears in a cutscene in the chapter "A New Journey". Eirika and Ephraim share a flashback in which they talk with Lyon about their ambitions in life, etc. . He uses the spell Naglfar in combat, as well as the spells Fenrir and Nosferatu in chapter 17. Lyon is recruited by beating the Lagdou Ruins three times and his spell, Naglfar, is an infinite weapon.