Outside of combat Hannibal seems like a completely different person. In his casual clothes he is dressed as if he were at a resort, in a short-sleeved safari shirt and shorts. He has round-framed glasses that give off an intellectual air, contrasting the rest of his outfit.
In combat Hannibal seems no-nonsense. He has an unwavering stern expression and gives off a menacing aura.
Outside of combat Hannibal is a loud and friendly middle-aged man. He is friendly to Erice Utsumi even though he is aware of her nature as a Servant-hunter. He likes to tell stories of his battles and make jokes about Rome.
Hannibal was originally a participant in the Holy Grail Tournament, and the leader of a tournament team which Koharu F Riedenflaus and her Servant Galahad were part of. Hannibal, Koharu, and Galahad ran into Erice Utsumi and Voyager at a coffee shop.
Before the tournament started Hannibal was turned into a Voodoo zombie by Nzambi but Nzambi had him keep it a secret. During the first team battle, Hannibal turned on his teammate El Cid, killing both him and his Master. Hannibal's elephants rampaged throughout the Colosseum until Hannibal was put out of his misery by Lucius Longinus.