Setsuna F. Seiei ( Gundam 00 )

Setsuna is taciturn, introverted, and wholeheartedly against war. He believes there are key disturbances that prevent the world from coming together in peace and harmony. He has labeled specific people and/or forces as a source of conflict towards the world's path to peace. He has little tolerance for diplomats and politicians, believing that their negotiations only prolong wars and cause more strife (due to personal experience). He's got a vendetta to settle and his past battle experiences stir up old bitter feelings, increasing his combat potential as a beneficial side effect. Though a self-proclaimed atheist, he often questions the motivations of God with people and worldly events.

He idolizes the Gundams so much that he wants to embody the Gundam as himself, a means to eradicate all conflict. He's a traditionalist in honor and a martyr for his cause in Celestial Being; he would not hesitate to die for his ideals. In a letter to Princess Marina Ismail, he revealed more of his feelings and thinking. Setsuna wanted to understand the lesser aspects of humanity. He wanted to know why the world is filled with people with innate dark intentions and inconsiderate of other people's suffering. He wanted to know why did people keep fighting to live in such a violent world. He wanted to find these answers along with his Gundam in hopes to bring mutual understanding and peace.

After a 4 year hiatus, Setsuna has taken an unofficial role as the leader of the Gundam Meisters. He is now able to assert and express his feelings to people without reservation. Setsuna's ideals are still the same, but his recent experiences have led him to believe in the importance of self-change and the need to fight for a better and brighter future. His determination and strong self-confidence motivates and inspires people around him. He's more understanding and compromising, but he is also capable of making hard-but-necessary decisions that would lead people to dislike him. He has no problems making life defining decisions for other people when they can't make the choice and would kill if necessary.

After Setsuna became an Innovator, he once again became stoic and closed his heart to people once again. The crew members had trouble dealing with his inconsiderate nature, but they did their best to adjust to him because they believe he'll eventually turn around. Sumeragi reasoned it was probably because he had become different from the others among the crew and was confused with his Innovator abilities. After the ELS Conflict, Setsuna had since become a friendlier and warm person in his eternal mission to promote mutual understanding.