Takeshi Gōda, known almost exclusively by his nickname Gian, is a foundational character in the Doraemon series. The name Gian is derived from the English word giant, a reference to his large and imposing physical stature compared to other children his age. He is an elementary school student recognized by his tall, robust, and somewhat overweight build, often depicted with black hair and a strong, intimidating presence.

Gian's personality is defined by a powerful contradiction between his role as the neighborhood bully and his hidden, often clumsily expressed, sense of loyalty. On the surface, he is aggressive, selfish, and quick-tempered. He rules the local children through physical force, frequently extorting their belongings under the pretext of borrowing them, with his favorite target being the hapless Nobita Nobi. His overconfidence is most famously displayed in two areas: singing and cooking. He genuinely believes he possesses a magnificent singing voice and exceptional culinary skills, when in reality his singing is painfully off-key, often causing listeners to faint, and his homemade dishes are notoriously inedible. He regularly forces his friends to attend his terrible concerts and eat his disastrous meals, demanding praise under threat of physical punishment.

Despite these antagonistic traits, Gian is not a one-dimensional villain. His primary motivation stems from a desire for control and recognition, but this is tempered by a fierce, almost unchallengeable personal code. He is utterly terrified of his mother, who runs the local grocery store and is the only person who can immediately subdue his aggressive behavior. More significantly, he harbors a deep, protective love for his younger sister, Jaiko. He supports her dream of becoming a professional manga artist with a sincerity that overrides his usual selfishness, often going to great lengths or even seeking Doraemon's help to make her happy.

In the main narrative of the series, Gian serves as the primary source of conflict and a catalyst for Nobita to seek Doraemon's gadget-based assistance. He acts as the captain of the local baseball team, which he fittingly named the Giants, and his aggressive leadership style and the team's poor performance often lead to him berating his teammates, especially Nobita. However, his role transforms significantly in the feature-length movies. In these longer adventures, when the group faces genuine, life-threatening danger, Gian consistently drops his bullying persona. He becomes a courageous and reliable ally, using his immense physical strength to protect his friends and fight alongside them, revealing that his loyalty, while buried, is authentic.

Key relationships define his character. With Nobita, the dynamic is that of a primary bully and victim, yet there are moments that hint at a grudging respect and even friendship. With Suneo Honekawa, the wealthy and cunning child, Gian enjoys a partnership where Suneo acts as a sycophantic sidekick, though Gian does not hesitate to turn on him. With Shizuka Minamoto, he maintains a friendlier, less aggressive rapport, generally refraining from the bullying he directs at the boys. His most significant relationship is with Doraemon, whom he respects as a source of power but also fears as a potential enforcer of justice.

While Gian shows little permanent character development within the episodic structure of the television series, often reverting to his bullying ways by the next episode, there are moments of self-reflection. On rare occasions, such as after a particularly lonely birthday, he glimpses how his behavior isolates him and makes a genuine, if short-lived, attempt to reform. The films provide the clearest development, consistently showcasing his bravery and capacity for self-sacrifice, suggesting that he will mature into a stronger and more dependable person. In the future timeline, it is shown that he eventually overcomes his flaws to become a good father.

Gian's notable abilities are almost exclusively physical. He possesses superhuman strength for a child his age, making him the most formidable fighter among his peers. He is an exceptional athlete and a powerful baseball player, though his poor sportsmanship undermines his talent. His most distinctive, though ineffective, ability is his terrible singing voice, which is so powerful it can be used as a form of attack, causing physical pain and disorientation to those who hear it. Alongside his strength, his defining characteristic remains his stubborn pride, which prevents him from ever admitting his faults in any lasting way.