Gian, formally named Takeshi Gouda, serves as a central figure in the Doraemon franchise, including the special "Doraemon's Time Capsule for 2001". His imposing physical stature and remarkable strength cement his reputation as the neighborhood bully. Gian frequently intimidates children, particularly Nobita Nobi, confiscating their belongings under the pretense of borrowing them and refusing returns. Despite this aggression, he exhibits fierce loyalty and protectiveness toward friends facing genuine peril.

Gian displays unshakeable confidence in his singing ability, though his performances consistently cause distress due to their poor quality. He forces impromptu recitals on others, ignoring their reactions. His culinary pursuits follow a similar pattern, yielding unskilled results that mirror his creative limitations. Stuffed capsicum remains his favored dish.

In "Doraemon's Time Capsule for 2001", a future iteration of Gian works as a supermarket manager. This version demonstrates significant growth: his previously abysmal singing has evolved into competent proficiency. When Nobisuke, Nobita's son, approaches him for information on a buried time capsule, future Gian provides helpful directions without displaying past aggression.

Gian cares deeply for his younger sister Jaiko. His family bonds and sporadic kindnesses toward Nobita and others suggest underlying complexity beyond his bully persona. His role in the special contributes to themes of legacy and time, particularly through interactions with Nobisuke and his matured future self. Gian also appears in the 2001 short film "Ganbare! Gian!!", though specific character details from that work are not elaborated.