A childhood friend of Jinta and Meiko and he witnessed Menma's death.
During their childhood, he had great admiration for Jinta and frequently called him 'amazing' or 'cool'. He admits that he was always grateful to the group for including him as he was an awkward child. Although he has dropped out of school, he is a world traveler that earns money by taking various part-time jobs and lives in the old secret base when not abroad. Tetsudo is worldly and mellow. He is eager to see the Super Peace Busters get back together, believing instantly that Jinta could see and talk to Meiko. He is the first to directly tell Meiko that he will fulfill her wish and help her spirit pass on. When the group fights, he is often the one that takes initiative to smooth things out. However, it is revealed later in the series that Tetsudo hides the deep guilt he feels over his role in Meiko's accident underneath his happy-go-lucky personality. In the past, he was the smallest child in the group. But not, he's the biggest.