Eurymachus, along with the majority of his fellow suitors, showed no regard for the Greek custom of xenia, or guest-friend hospitality; Eurymachus was arrogant, disrespectful, and consumed food and drink without the slightest reciprocation. He was noteworthy for being manipulative and deceitful, at one point even fooling Penelope into thinking him without ill-intent. Although he arranged for the death of Odysseus's son, Telemachus, his plan failed and he was later killed by Odysseus. He claimed, in his childhood, Odysseus befriended him often, and told Penelope that made Telemachus his dearest friend on Earth, and he would protect him, though death for Telemachus was in his heart. Penelope's maid, Melantho, was also his lover. After Antinous was shot, Eurymachus appealed to Odysseus, blaming Antinous for all the trouble that had been caused and saying what the Suitors took would be repaid. Odysseus, however, maintained that killing would continue until he had satiated his taste for vengeance, whereupon Eurymachus ran at Odysseus with his sword, but Odysseus shot an arrow into Eurymachus’s chest, stopping him dead.
Jason Grace, Piper McLean, and Annabeth Chase met Eurymachus, now an ally of Gaea, and the other suitors when they went to Ithaca. Antinous kills him after he reveals too much information to Jason Grace.