Tetsuo Tosu, one of the main characters in the manga My Home Hero, is a complex and multifaceted individual who undergoes significant character development throughout the series. At the start of the story, Tetsuo is introduced as a typical salaryman in his thirties, with a wife and young daughter. He is quiet and reserved, rarely speaking his mind or standing up for himself.

Physically, Tetsuo is unremarkable in appearance, with a slightly pudgy build and thinning hair. He wears plain, practical clothing and seems to have little interest in fashion or grooming. However, as the story progresses, it becomes clear that Tetsuo's unassuming exterior masks a deep well of emotional turmoil and personal demons.

Tetsuo is haunted by a traumatic event from his past, which has left him with intense feelings of guilt and self-loathing. He struggles to connect with his wife and daughter, feeling as though he is unworthy of their love and unable to protect them from the dangers of the world.

Despite his internal struggles, Tetsuo is a fiercely loyal and protective individual who will go to great lengths to keep his loved ones safe. As he begins to confront his demons and take control of his life, Tetsuo develops a newfound confidence and strength of character, becoming a true hero in his own right.