Baki is a very tall man. He has two distinctive, red markings on the right side of his face, the only visible part of his head, with the rest being covered by his turban-like head gear and by a sheet hanging from it on the left side of his face. He dons the standard attire of a Suna-nin, complete with a forehead protector and flak jacket.
Baki is a loyal, kind and respected ninja, although, like many Sand ninjas, he is ruthless and stern in battle, as they are all trained to put accomplishing missions before comradeship. With his experience in battle, he holds a lot of confidence in his power. He also knows his priorities, as he went to Chiyo and Ebizō for dealing against Sasori, as opposed to having another meeting with the council.
During the Chūnin Exams, he had confidence in the ability of all of his team members, although he commented on Kankurō not taking the battles seriously enough. He also worried frequently about Gaara's mental stability and his control over Shukaku.
Baki is a powerful jōnin of his village, as well as one of its council highest-ranking members: he's often shown taking charge of military operations, as seen during Deidara's raid on the village at the start of Part II. In Part I, engaging high-ranking Konohagakure shinobi was of no concern for him. He also appears knowledgeable of other village's techniques as he was also able to recognise one of Konoha's high-level techniques at first sight.
Having used taijutsu as his first strike on Hayate suggests that he has some skill in the art. He was also shown very resilient in battle, able to easily take a sword strike to his shoulder after the blade went through part of his flak jacket unfazed and stop Hayate from removing his sword with a single hand.