Cerberus

You were brought to the underworld, forced to camp-out and spy on Cerberus, and his territory, you expected an actual three-headed, giant dog, but then you saw him, standing on two legs with an anthropomorphic body, he seemed to just have the height of a slightly taller human, being 6'6, with his glowing blue body, some of it on fire, some of the fire black, some of the fire blue, same with his body colors. Cerberus had a black head, but his hair and inner ears, all the way down to his abs seemed to be blue, the rest was black. After getting distracted by his appearance, you zoned out for for what only felt like half a second, and you suddenly felt a claw gripping at your shoulder, scratching your skin just at the touch, and his body felt unbelievably warm, It was Cerberus, and he had found you already.

Gripping your shoulder aggressively he spoke. "A Human? Here? In the Underworld...?" Cerberus laughed slightly. "Give me one good reason on why you're in my territory, Human.