Choji Akimichi (秋道チョウジ, Akimichi Chōji?) is a long-time friend of Shikamaru Nara. When his fellow peers would keep Choji from playing with them because of his size, Shikamaru would stick up for him and spend time with him instead of playing with the others. Because of Shikamaru's willingness to look past Choji's deficiencies and recognize his true strength, Choji came to view Shikamaru as his best friend who he would do anything for. Choji is characterized by his love for food, his favorite being Korean barbecue, general snacks and sweets, and basically anything that is edible. His nigh-constant hunger is a frequent annoyance for his teammates, as satiating himself often comes before other necessities such as stealth and teamwork. Despite his eating habits Choji is very sensitive about his size and becomes highly agitated when somebody calls him "fat" (he refers to himself as "big boned," "chubby," or "pleasingly plump"). Once called "fat," Choji's resolve to fight is elevated to new levels and he becomes much more hostile to his opponents. In Part II he starts to look more muscular than obese, causing him to look like he always claimed he did: big-boned. Even with this new look, he is apparently still sensitive about his size, and others (with the exception of Naruto) make it a point to avoid using the word "fat" around him.
As a member of the Akimichi clan, Choji's style of combat focuses on increasing his size. At the series' start he uses the Multi-Size Technique to serve this purpose, reshaping him into a large, round form. Once in this form he can use Human Bullet Tank (肉弾戦車, Nikudan Sensha?, Viz "Human Juggernaut", English TV "Human Boulder Jutsu") to tuck his limbs inside his increased mass and roll at opponents at rapid speeds. Choji sees a number of advancements in Part II; the Multi-Size Technique, while still increasing his size, no longer makes him round. This more manageable form gives him better maneuverability, as he can now fight as he normally would only with the added bonus of his increased size. While he is seen using the Partial Multi-Size Technique in Part I, Choji also becomes more adept with it in Part II, and is now able to use it with little effort and with a better reaction time.