Sentinel is the master of protection and very dangerous foe as well. He can trade protection for firepower anytime, but once he drops the shield, he can't get it back.
Sentinel, like many other clones, he wears a blue cap, torned pants, a belt, a shield and a shotgun on his back which is his main weapon. He has black eyes, brown eyebrows and brown hair. Fights aganist red clones, and does not wants to talk about Frederico(Leader of Red Clones army) if you asked about Frederico.