Dr. Thorn

Dr. Thorn is a manticore and prominent figure in Kronos' Army. He speaks with a heavy French accent, and is vice principal of a military boarding school. His chosen weapon are his poisonous barbs which he throws from his tail, and his mission in The Titan's Curse was to hunt down Nico di Angelo and Bianca di Angelo and get them to join Luke's Demigod army. He was killed by Dionysus.

The Titan's Curse
Dr. Thorn became a vice principal of Westover hall, he had suspected two students there, Nico and Bianca di Angelo were powerful demigods. He first met Percy, Annabeth and Thalia at the entrance, and their arrival confirmed Dr Thorn's suspicion. During the dance he took Nico and Bianca away while Percy followed, Thorn ended up capturing the three to a nearby cliff to make his escape. As his escape helicopter was arriving he was ambushed by Thalia, Grover and Annabeth. He was powerful enough to hold his own against them when the Hunters arrived causing him to jump off a cliff, with Annabeth on his back. He delivered Annabeth to the General.

Dr Thorn was seen again by Percy when he was tailing Annabeth, Grover, Thalia and Zoë on their quest at the Smithsonian Air and Space Museum. He went into the natural museum to meet the General. He was later seen again on the docks in San Fransisco, showing contempt of the Skeletons that were supposed to be the ones to capture Percy. He battles the quest team and he nearly prevails when Dionysus kills him by wrapping him up in grape vines.