Although it may take a bit for him to decide to act on his thoughts, it's very clear that Seign is a character who has a mind of his own and won't stand up for unjust actions that pop up throughout Eiyuden Chronicle: Hundred Heroes. He is a morally driven man who takes things very literally, analyzing details closely.
During The Hishahn Front Seign hears of the emperor's murder and knows that Dux Aldric has impure intentions with the entire war happening. At this moment he turns against the army he's fighting with, encouraging his soldiers to do what they think is right with no repercussions from him. They join Seign and when the battle is over he approaches the Alliance, telling them what he knows, and offers his assistance and you recruit him along with a few others.
Role: Battle
Range: Short
Damage Type: Slash
Defense Action: Defense - Assume a defensive stance to take half damage this turn
Rune Slots: 6
Active Skills: Sword Rain - Release the regule's power to deal slash damage to a column of enemies. Cost: 2 SP.
Healing Drops - Slightly restore one ally's HP. Cost: 10 MP.
Water Veil - Boost allies' magical defense for 3 turns. Cost: 20 MP.
Recovery Wave - Moderately restore HP to all allies. Cost: 40 MP.
Enhanced Skill: Rune of Speed - Increases speed by 5%.
Rune of Clunt Resistance - Increases smash resistance by 10%
Friendship Combo (w/ Nowa) - Deal all enemies moderate slash damage. Cost: 1 SP.
Heroes Combo (w/ Nowa and Marisa) - Deal one enemy massive slash damage. Cost: 2 SP.
Young Imperial Combo (w/ Valentin and Pohl) - Deal all enemies heavy damage. Cost: 3 SP.
Complete Heroes Combo (w/ CJ, Marisa, Nowa, Isha, and Garoo) - Extreme aerial damage to one enemy and boost all allies' attack power for 3 turns. Cost: 1 SP.