History
"Percival" was the youngest member of Arthur's technological brotherhood called The Circle, he was trained by Lancelot.
During an auction run by A.I.M., the Circle bought part of the replicated Extremis technology, creating new and better exoskeletons for their own purposes. After they noticed Iron Man was in the search of the Extremis which A.I.M. stole, Arthur proposed Stark a wager, if Stark defeated the Circle's Extremis-enhanced pilots, he would be free to retrieve the Extremis.
Percival, being the most inexperienced member of the Circle, was nervous to fight Iron Man, reason why Lancelot went instead of him to fight the Armored Avenger.[1]
When the powerful material Phlogistone was found in the Moon, the Circle was sent to Tranquility Gulch, the human colony from which the Phlogistone was studied, as representatives of Symkaria.[2] They later helped Iron Man attack the embassy of the country of their common enemy, Doctor Doom, in an attempt to prevent any Phlogistone from reaching Doom's hands.[3]
Later Percival was with his fellow Circle members who threatened to arrest X-Force for the theft of stolen goods in Aniana. They ended up in a battle against Cannonball and Shatterstar when the two refused.[4]