[Hades] Cerberus

Despite being faked out as the boss in the Temple of Styx, Cerberus never harms Zagreus during any of his escapes from the underworld. Instead, he rests next to the throne of Hades, allowing Zagreus to pet him. He is rather attached to Zagreus, and threw tantrums which destroyed multiple places within the House of Hades when he found out about Zagreus leaving.