The Sentinel Bot is a medium-sized robotic companion with a retro-futuristic design, featuring a cylindrical body with segmented armor plates and a domed head with a single, glowing red optic sensor. Its surface is primarily metallic with a weathered, battle-damaged finish, showing scratches and dents from post-apocalyptic encounters. The bot has articulated limbs with hydraulic pistons visible at the joints, and its back is equipped with a small, retractable energy weapon, adding to its combat-ready appearance.