Juumonji, Kazuki

十文字一輝

40-yard dash: 5.5 seconds
Juumonji appears to be the leader of the "Ha-Ha Brothers." On several occasions, such as during the NASA Aliens game and the Death March, he acts as a leader who urges the other two to follow him. He has an X-shaped scar on his right cheek and is the only one of the trio to realize that Sena is actually Eyeshield 21. He seems to be the most thoughtful of the group (in a positive sense). He always seems to keep the three of them together and is regarded as the "eldest brother" among them. He gets fired up frequently. He is also the first of the three to score a touchdown. This is nearly miraculous, given that his position almost never handles the ball, yet he managed to cross the goal line. He is also the first to take football seriously, occasionally sympathizing with Sena and vowing to become a better lineman to assist him. Juumonji also has an uneasy relationship with his father, who constantly tells him not to associate with his friends, dismissing them as "trash" (similar to Agon).
It is revealed that Juumonji is one of the smartest members of the team. In an omake comparing the intelligence of the Devil Bats, he ranked above everyone else, though still below Hiruma, Mamori, and Yukimitsu. (Musashi was not included).
Musashi has commented that Juumonji is 'the same kind of guy as him' in terms of attitude (stoic and samurai-like). Juumonji and Musashi tend to react in the same way to outrageous incidents.
In the anime only, he suffers from acrophobia, a problem which Doburoku admits that not even finishing the Death March can fix.
His last name means "cross," most likely a reference to the scar on his cheek. It is possible that the scar itself is hereditary, as his father has the same scar on his forehead.