Pyrrhus

Description
Formally named Neoptolemus, but called "Pyrrhus" for his fiery hair, he was the son of Achilles and the princess Deidameia. Pyrrhus is a sadistic perversion of his father’s legacy, heir to his strength and capacity for violence, but not his humanity. When he gets to Troy, Pyrrhus takes his father’s place as one of the most terrifying and reckless warriors of the Greeks. He is among those in the Trojan Horse, and according to the Odyssey, the only one who isn’t afraid of being caught. Once inside the city of Troy, he uses an ax to tear his way into Priam’s palace, leaving a bloody trail behind him. From the book: "'He is the one who kills Priam. He is the one who hunts down Hector’s wife, Andromache, hiding in a cellar with her son. He plucks the child from her arms and dashes his head against the stone of the walls, so hard the skull shatters like a rotted fruit. Even Agamemnon blanched when he heard'."Vergil tells the story of his part in the sack of Troy in Book 2 of the ''Aeneid. ''

From the book
"His child with Deidameia. A boy, Thetis had told him, called Neoptolemus. New War. Nicknamed Pyrrhus, for his fiery red hair".

Pyrrhus commands, after Patroclus and Achilles's deaths, that the monument to Achilles will not be shared with Patroclus as Achilles wished, saying that he would "not allow [his] father’s fame to be diminished. The monument is for him, alone".