Like the other Numbers, Inbi is immensely tall, towering over even normal giants and being similar in size to an ancient giant.
He is similar in appearance to common cultural depictions of Satan or the devil, possessing long and pointy ears, a handlebar mustache, dark hair with a prominent widow's peak, and a pair of horns that extend from the area above his ears and curve upward. His face is often seen curved into a sinister expression. He wears a light-colored shirt, dark-colored pants, small ring-shaped earrings, long boots ending in a cuff, and a Shimenawa-like rope around his waist like a belt. His hands have sharp, dark-colored fingernails. He appears to have the daiji 壱 ("one") tattooed on the right side of his chest.
Like the other Numbers, Inbi likes to consume alcohol, as evidenced by the multiple sake jars beside him. However, Inbi is shown holding a cup rather than a barrel, and does not appear intoxicated, suggesting he has better drinking habits than the others. He also possesses a unique laugh which plays off his name: "Ibibibibibi" (イビビビビビ,"Ibibibibibi"?).
Abilities and Powers
Inbi's abilities have not been shown, but given his nature as an artificial ancient giant, he is likely tremendously powerful.
Sometime in the past, Inbi was part of an experiment on Punk Hazard that attempted to artificially recreated the ancient giants. The experiment was deemed a failure, and Inbi and his fellow test subjects were eventually bought by Kaidou, becoming known as the Numbers and residing on Onigashima.
Inbi and fellow Numbers Fuga and Zanki were eating and drinking in a Skull Dome chamber together, and were not participating in the war that broke out between the Beasts Pirates and Ninja-Pirate-Mink-Samurai Alliance. They were eventually joined in the room by Apoo and X Drake. Inbi sat while Apoo and Drake fought. After Yamato passed through the room, Apoo chased after her and ordered Inbi and Zanki to follow him. After Apoo and Drake encountered and engaged the CP0 on their chase, Apoo abandoned the fight alongside Inbi, running down to the 2nd Basement Floor.
When they were unable to escape from the basement due to the fire, Inbi tried to break through a wall but the wall got too hot and he gave it up, so Apoo scolded him, telling him that if he didn't break it, they would die, adding that he could also sacrifice an arm and to make himself useful with his enormous body. When Inbi got furious Apoo asked him if he intended to go under.
Inbi's name contains the kanji for "one" (一,"one"?) and the kanji for "beauty" (美,"beauty"?).