Takeshi Goda, universally known by his nickname Géant, is a central figure in his neighborhood and a character defined by a striking contrast between his role as a local bully and his capacity for unexpected loyalty and courage. His nickname, derived from the English word giant, directly reflects his most prominent attribute: his large, imposing physical stature, which is a head taller and significantly broader than most children his age. He has short black hair, a round face, and tan skin, typically dressed in an orange shirt and dark trousers, a look that has become his visual signature. He comes from a working-class family that runs a small grocery store, a setting that heavily influences his home life, most notably his profound fear of his mother, the sole person who can control him with her strict discipline.

On the surface, Géant's personality is defined by his aggressive, selfish, and domineering behavior. He rules the local children through physical intimidation, using his superior strength to take toys, comic books, and other possessions from others under the pretense of borrowing them, with Nobita Nobi as his most frequent target. He is aided in his bullying by his close associate, Suneo Honekawa, who often acts as a sycophantic sidekick. Beyond his thievery, Géant pursues two hobbies with complete obliviousness to his own lack of talent. The first is singing, which he believes is a great skill, but in reality, his powerful, off-key voice is so terrible it can cause listeners physical pain and even faint. He regularly forces the neighborhood children to attend his lengthy, awful concerts. The second is cooking, where his creations are equally inedible and forced upon his unwilling friends. He also captains the local baseball team, the Giants, where his poor sportsmanship leads him to physically abuse his teammates, especially Nobita, for the team's frequent losses.

However, these abrasive qualities do not tell the whole story. Géant operates on a simple, unspoken code of conduct. While he bullies his friends, he will almost never tolerate anyone else doing so. When the group faces a genuine, serious threat, which often occurs during the franchise's long-form movie adventures, his demeanor undergoes a complete reversal. He sheds his role as the antagonist and becomes a brave, dependable, and even heroic figure, willing to put himself in danger to protect his friends. This duality suggests that his bullying is less about genuine malice and more a misguided way of asserting his dominance in a world where he feels intellectually or socially outmatched. His greatest soft spot is for his younger sister, Jaiko. He is extremely protective of her and supports her dream of becoming a manga artist, showing a gentle, caring side he rarely displays elsewhere.

His relationships are the core of his character development. His dynamic with Nobita is the most complex; outside of his sister, Nobita is his primary victim, yet in moments of crisis, Géant is often the first to stand by his side. In the future, it is shown that he overcomes his brutish nature and grows into a responsible and good-natured adult and father. His love for singing, while a source of torment for others, is a genuine dream, and his overconfidence represents a pure, if misguided, passion. Ultimately, Géant is the quintessential schoolyard bully with a heart of gold. He is a force of chaos in everyday life due to his strength, temper, and terrible singing, but he is also a figure of strength and surprising reliability when his friends face a real crisis, making him an indispensable member of the core group.