Shii is a Kumogakure shinobi who escorts the Raikage along with Darui. C is a young man with short blond hair and dark eyes. He wears a sleeveless black shirt with a one-strap-over-one-shoulder white flak jacket, forehead protector, black elbow length arm guards, and red and white Kumogakure shin-guards.
In contrast to his easy-going partner, C is portrayed as serious and putting Kumo's well being above all else. This is briefly shown when he told Darui there was no time for rest upon their return from the Kage Summit. He also seems to have a slight dislike of Konoha ninja, calling Naruto's group "Konoha Dogs".
C is a sensor type shinobi, allowing him to sense the chakra of others even from extended distances. He is also a medic-nin and seems to be very knowledgeable on foreign shinobi techniques, as he is shown recognizing Sasuke's Mangekyō Sharingan along with Amaterasu. C was able to deduce how Sasuke's Blaze Release worked after only seeing it once. He is also a skilled genjutsu user, as he was shown using Lightning Illusion Flash of Lightning Pillar, followed by a second genjutsu within the first.
All of these abilities also imply a mastery of multiple skills requiring very fine chakra control.
Also of note is when he went to defend the Raikage from the bodyguards of the other Kage he took a defence taijutsu stance, implying he is competent in close combat as well