Apperance: Polybotes is described as a giant at least forty feet tall, with reptilian legs similar to a Komodo dragon. From the waist upwards, he has a green-blue breastplate shaped with faces of monsters. He has a human face with wild green hair that has basilisks hanging down from it. His presence is so strong that it could almost "attract every bit of iron in the blood", as stated by Hazel.

Characteristics: Polybotes is very narrow minded and never strays too far from the idea of eventually killing Poseidon/Neptune. He also plans on doing so in the most painful way possible, hinting at sadistic tendencies. He has complete faith in his plans, which is shown when even after they start to go south, he believes he can succeed. Polybotes can also be level-headed, as shown when he walked away from Iris' shop and later not attacking Camp Jupiterdue to a decrease in forces.

He can, however, be easily baited and is quick to anger when things don't go as he planned, such as when Percy arrived on the battlefield and when the Amazons turned on him. Polybotes doesn't always notice the obvious, which could be part of his narrow-mindedness. He failed to notice that half his cyclops army had vanished until stopping at Camp Jupiter, and later failing to realize that Terminus was a god, allowing Percy to defeat him. He is also arrogant, as being the bane of Poseidon and a giant makes him believe he can't be killed, especially not by a child of Poseidon. Polybotes is very vengeful, as he chased Percy all over Tartarus in order to avenge his defeat.