Shulk is determined, organized, strong-hearted, smart, and quick-witted to the bone. Despite being called out by Dickson for spending too much time indoors doing research, Shulk is a very kind person and is often seen trying to help others. He likes to think things through and is very methodical in his approach to most situations. However, Shulk is also portrayed as being oblivious to other peoples' feelings. Despite his gentle nature Shulk is roused to great hatred and vengeance against the Mechon after they attack Colony 9, revenge being the main factor that leads him and Reyn to begin their journey. Shulk trusts his companions above anything else, and goes to great lengths to protect them. Shulk also tends to be pessimistic, often feeling particularly frustrated if and when he fails to change the future seen in his visions.

Reyn serves as the muscle of the group in more ways than one, not just having a strong body but also a strong heart. His one goal is to protect those he cares for, reason as to why he joined the Defense Force in the first place. Despite not being the smartest of the group, he understands when he needs to get serious. Reyn is also quite emotionally charged and has a habit of losing his temper at times. But at the end of the day, he never lets go of who he is, as he seems to take pride in being himself, which also causes him to get annoyed whenever Sharla compares him to Gadolt. However, Reyn does have some feelings of doubt of his abilities at times, as he mentioned when he anguished on how ineffective he was when protecting others while Shulk wielded the power of the Monado.

Fiora has been shown to be a very kind and caring person who wants to help everyone. She is the primary carer for her brother in the year after his injury at the Battle of Sword Valley, and also incredibly protective of Shulk, to the point where she does not even trust Reyn with his safety. Despite being a careful person, Fiora does not hesitate to take courageous, self-sacrificing actions when necessary to protect others, which can lead to dire consequences Fiora will do nearly anything to help people, but she often does so without thinking about how everyone will feel afterwards.

Dunban is a soldier and a hero with a true heart. He is always willing to put his own life on the line to save everyone else. He is easily the most mature member of Shulk's party, frequently reminding the others not to get cocky or careless and stay focused. He does at times let his boldness get to his head, but he tries to avoid being a coward and motivate his fellow comrades to do the same. As second-in-command and mentor/adviser of the team, Dunban is the voice of reason and speaks for everyone in some of the most dire times. Dunban is also unshakably determined, even more so than the rest of the party, continuing to wield the Monado even after it starts to degrade his body and paralyses his right arm, though he is ultimately relieved when Shulk decides to wield it. Dunban never forgets that family and friends are important even in the battlefield. He serves as a mentor to Shulk and Reyn; but even though he has patience, he knows better than to be their babysitter and expects them to depend on their own strength.

Sharla is a kind-hearted, strong-witted, and loving person. However, she has a vengeful side that is first seen when Xord reveals that he ate the entire Defence Force of Colony 6. She is also shown to be devoted to those she cares for, especially Gadolt and her young brother Juju. She originally became a medic so she could protect Juju and heal him whenever he got hurt. Although after particularly harrowing incidents causes Sharla to lose her will to continue, encouragement from the party and her own resolve to fight allows her to carry on, determined to keep fighting until the antagonistic forces that threaten those she cares for are taken down once and for all.

Melia is a very humble, modest and kind person, never looking down on Homs as inferior (which pure-blooded High Entia often seem to), though this may be because she is half-Homs herself. When the party first meet her, Melia slaps Shulk for touching her, suggesting that she was brought up with traditional values. She instantly apologises and offers to help the Homs in exchange for saving her life. She eventually develops romantic feelings for Shulk, although she keeps them to herself. She is implied to be jealous of Fiora, but does not let these feelings impede their friendship. Eventually, Melia accepts that Shulk will never reciprocate her feelings and is content to remain friends. Melia has a strong sense of duty and, due to her status, believes that she should be capable of doing tasks bequeathed to her alone. Being a princess and due to a fairly strict upbringing, Melia is partial to polite and formal behaviour, and is one of the most serious members of the group along with Dunban. Her lack of familiarity with others is also due to her isolation growing up

Riki often goes on at length about how he is actually a legendary hero spoken of in Nopon prophecy. In truth, his position as a "hero" was only granted by Chief Dunga as a way to pay off the heavy debts that have arisen from his and his children's huge appetites. Apart from this, Riki has very little involvement within the story's major plot, instead contributing to most of the game's comic relief. Due to his overconfidence of being the "Heropon," Riki is also prone to bouts of childish "hero talk," often describing events in a way that made it seem like he contributed much more than he actually did. In-battle quotations show this very well, as he exclaims several lines such as "Heropon run from nothing!" and "Heropon is biggest, strongest!", while also calling his party members "sidekicks" to give himself more of the limelight. Sometimes, he will even outright proclaim that an issue that has been solved was "all thanks to the Heropon." However, this is all taken lightly by Shulk's party.