Bugbear

The Bugbear was a legendary creature that was the son of Echidna, mother of monsters. He described to be a mutated bear tha stands on two legs, and the head of a monstrous goblin.

The Son of Neptune
He was seen where he met with Logan and Dylan where they were planning to resurrect Gaia. He is seen in the Island of Nisyros where he encounters the heroes when Logan and his followers were resurrecting Polybotes. He fights against percy, but he is always distracted when Bobby calls him bugaboo. The Bugbear gets enraged, and prepares to slash the heroes to pieces. This was when Gwen jumped on his back, letting Percy stab in the chest, and sending his ashes to Tartarus.