Cerberus is a multi-headed dog that lived down in Helheim. He is also the "Watchdog of Hell" (地獄の番犬, Jigoku no Banken) and is loyal to Hades.
Appearance[]
Cerberus is an enormous three-headed dog with sharp teeth and claws, alongside black fur. The middle head has five eyes, while the right head has six eyes and the left head has at least two eyes.
Personality[]
Cerberus' personality is not known, but from what is shown, Cerberus appears to be a vicious and savage creature. However, when confronted with someone more powerful then him, he becomes very obedient, as seen when he willingly dropped his head to Hades.
Plot[]
Past[]
At some point, Hades and Cerberus met each other and Cerberus swore loyalty towards the King of the Netherworld, most likely in deference to his power. At some point, Heracles would also managed to defeat Cerberus by punching him into submission.
Ragnarok: Fourth Round[]
Cerberus is summoned by Heracles during the Fourth Round
During the fourth round of Ragnarok, Heracles summoned Cerberus to fuse with him, in order to become more powerful. After Heracles' defeat, it is unknown if Cerberus died alongside him or not.
Abilities[]
Overall Abilities: Cerberus' abilities are not known. However, he is stated to be very powerful.
Fusion: Cerberus can fuse with other beings in order to make them stronger. Heracles is the only known example. However, the fusion appears to include side-effects, since Heracles had his life force drained continuously due to the fusion.