Komaeda likely suppresses any real feelings of sorrow or fear as a coping mechanism, because he experiences tragedy often due to his luck. He has also seen very unlikely and strange things due to his luck, which is why he is not easily surprised. As a result of everything he's been through, he has become more emotionally numb and he is rarely openly angry or scared. He often lacks appropriate emotions in situations where most people would be afraid, like threats of violence. Even so, he once mentioned that he feels fear every day of his life, most likely because of his luck. Furthermore, he can be very angered by despair and other things he considers insulting toward hope. When he does express anger, he becomes notably more serious. When displeased, he is very passive-aggressive.

Komaeda is capable of feeling some guilt and care for others, and he does not truly enjoy the suffering of others, but the hope born from it. Still, he is typically very emotionally cold and doesn't seem to feel much remorse or grief neither. He's shown to be fine with tricking, manipulation and stealing, though it should be noted that he does these for the sake of a bigger goal rather than his own ends. He has been described as a very honest person, though he will lie if he finds it necessary. While he prefers to do things on his own, he is very lonely and often tries to join the other Ultimates in their activities and becomes really happy if he's given attention, even if just a little bit. It's also implied that he intentionally keeps his distance from others because he wants to protect them from the disasters caused by his bad luck.

Komaeda is also one of the most intelligent characters of the second game, being very cunning and smart. He often solves a case long before the others, but he doesn't want credit for this. Instead, he often acts ignorant during the trials, manipulates the conversation by giving (often unnoticed) hints and then praises the others as if they're the ones who figured it all out. He does this because he considers himself too unimportant to take a more openly active role, wants to see the other Ultimates figure things out by themselves, and he wishes to remain neutral until he can determine which side has the stronger hope.