Tetsudō “Poppo” Hisakawa has a tall stature and a medium build as a young man. He sports mid-length brown hair and brown eyes, giving him a warm and approachable look. His signature outfit includes a lilac bandanna tied around his head, a white undershirt, and a blue button-down collared shirt with light blue patterns. He pairs this with olive drab pants featuring side pockets and a blue pearl necklace attached to the side. His casual style is completed with sandals that have grey straps and brown soles. Additionally, he wears a distinctive pouch necklace around his neck, adding to his adventurous and free-spirited vibe.

As a child, Tetsudō has a much smaller frame and a shaved head, leaving only a grey fuzz on top. His youthful outfit consists of a blue short-sleeved hoodie, blue-green track pants, and yellow shoes, reflecting his playful and energetic nature during his early years with the Super Peace Busters.

As a child, Tetsudō “Poppo” Hisakawa greatly admired Jinta “Jintan” Yadomi, often referring to him as “amazing” or “cool.” Despite being somewhat awkward, he felt grateful to the Super Peace Busters for including him in their group, cherishing the bond they shared.

In the present, Tetsudō is mellow, worldly, and easygoing. He is the most eager to reunite the Super Peace Busters and is quick to believe Jinta’s claim that he can see and talk to Meiko “Menma” Honma. Tetsudō is also the first to directly communicate with Menma, promising to fulfill her wish and help her spirit move on. Within the group, he often takes the initiative to mediate and resolve conflicts, acting as a peacemaker during heated moments.

However, beneath his cheerful and carefree personality, Tetsudō harbors deep guilt over his perceived role in Menma’s tragic accident. This inner turmoil is masked by his happy-go-lucky demeanor and his adventurous lifestyle. Despite dropping out of school, Tetsudō has become a world traveler, funding his journeys by taking various part-time jobs. When he is not abroad, he resides in the group’s old secret base, which he has maintained as a sanctuary for their shared memories.

Tetsudō (鉄道): The given name Tetsudō translates to “iron”(鉄, tetsu) and “path” or “road”(道, dō), which can symbolize strength and a journey, reflecting his enduring spirit and adventurous lifestyle.

Hisakawa (久川): The surname Hisakawa means “long time”(久, hisa) and “river” or “stream”(川, kawa), which may represent continuity and flow, symbolizing his lasting connection to his friends and the passage of time since their childhood.