Jinta Yadomi // Jintan
Jintan was a bold and energetic child, naturally assuming the leadership role within his group of friends, which he labeled the “Super Peace Busters.” After losing his loved ones, Jintan had become withdrawn, refusing to attend school and avoided the outside world as much as possible. When Menma first appears before him, he takes it as a manifestation of his internal stress and trauma.
Meiko Honma // Menma
Eita's "childhood friend." Although she was once a Kendo practitioner whose skills could have taken her to the national championships, she suffered injuries in an accident during middle school leaving her unable to practice Kendo. She sees Eita's girlfriend, Masuzu, as her enemy. She loves to eat meat at every meal.
Naruko Anjo // Anaru
Anaru spent her childhood introverted and insecure. She was sensitive about her hair and glasses, and was jealous of Menma’s looks and easygoing personality, as well as her close relationship with Jintan. Anaru and Jintan would later attend the same high school, and when Jintan became withdrawn, she was the one to reluctantly look after him. Despite their strained relationship, Anaru continues to have feelings for Jintan, conflicting with her guilt over Menma’s death.
Atsumu Matsuyuki // Yukiatsu
Yukiatsu was always somewhat cold and distant, traits that only grew more pronounced as he got older. Like Anaru, he was jealous of Jintan’s relationship with Menma, as well as Jintan’s assumed leadership role. Yukiatsu still struggles with Menma’s death, and his cool demeanor breaks down whenever someone mentions her name. He attends the same high school as Tsuruko. While the two are still extremely close, he is completely oblivious to her romantic feelings toward him.
Chiriko Tsurumi // Tsuruko
Tsuruko was a quiet and observant child. She learned to watch others and foresee their unspoken feelings, that she tends to keep them to herself, along with her own feelings, to others. She harbors a deep affection for Yukiatsu, but knowing his attachment to Menma, she does not pursue him and remains as nothing more than a friend to him. Once the group reunites, she begins to open up and attempts to heal herself as well as the others.
Tetsudo Hisakawa // Poppo
The younger Poppo was always enthusiastic and idolized everything Jintan did. He was oblivious to the emotional turmoil in the group and focused only on having fun with the others. Eventually, he drops out of high school in favor of traveling the world. In between trips, he lives in the old secret base. He accepts Menma’s presence without question and devotes all of his energy in helping Jintan grant Menma’s wish.
Many of the characters’ nicknames come from combining parts of their first and last names (e.g. Naruko Anjo becomes Anaru).
In Poppo’s case, his first name Tetsudo means “Railroad,” and “Poppo” is the horn sound made by trains in Japanese.