Takeshi Gouda, known as Gian, is a central character. He possesses a large physical stature, tan skin, and black hair, creating an imposing presence among neighborhood children. Gian lives with his parents and a younger sister, Jaiko, whom he fiercely protects, sometimes to her annoyance. His mother runs a local grocery store and is the only person Gian genuinely fears; she often physically punishes him for shirking responsibilities or bullying others.

Gian primarily serves as an antagonist, ruling the neighborhood through intimidation. He frequently bullies other children, especially Nobita Nobi, "borrowing" their possessions under his motto: "What's yours is mine and what's mine is mine." His aggression includes physical violence against Nobita for minor or no reason, and he occasionally mistreats animals. Gian lacks self-awareness about his flaws, believing his terrible singing voice and poor cooking skills are exceptional. He subjects others to torturous concerts or meals, oblivious to the negative effects.

Beneath his abrasive exterior, Gian exhibits loyalty and emotional depth. As captain of the local baseball team, the Giants, he intensely values winning, often blaming teammates like Nobita for losses. However, in critical situations, especially in films, he demonstrates unwavering commitment to his friends' safety—rescuing Nobita from drowning or aiding Doraemon in crises. He cries during touching moments and occasionally reflects on his unpopularity, attempting self-improvement after realizing his behavior drives others away. These attempts often fail due to mockery from peers like Suneo, leading to relapses into aggression.

Gian's relationships are complex. He relies on Suneo Honekawa as a sidekick, though their friendship is lopsided and Gian sometimes bullies him. Despite terrorizing Nobita, Gian harbors an unspoken desire for friendship, admitting once, "Nobita, I actually really want to be friends." He respects Shizuka Minamoto, halting aggression when she intervenes. He collaborates with Doraemon when Jaiko's interests are involved, showing rare vulnerability. His constant demands for Nobita's assistance or companionship reveal an unexpected layer of attachment.

Across media, Gian's character development highlights his duality. Films like *Nobita's South Sea Adventure* show him prioritizing others' safety, showcasing selflessness. Spin-offs like *Parallel World Gian* explore an alternate version where he is cowardly but possesses a beautiful singing voice, inverting core traits. These narratives underscore his foundational role as a bully with hidden compassion, consistent in his protectiveness of Jaiko and moments of solidarity with the group during adventures.