Trigger is a male Osean Air Defense Force pilot, a member of the Long Range Strategic Strike Group and former member of Mage Squadron. Following his alleged murder of former Osean President Vincent Harling, he was reassigned to an Osean Air Force penal unit, Spare Squadron. He later became the leader of Strider Squadron in the LRSSG.
A renowned and feared pilot, his unique aircraft marking earned him the nickname "Three Strikes" by those on both sides of the Lighthouse War. His accomplishments include playing a key role in defending Stonehenge, destroying Arsenal Bird Justice, shooting down two ADF-11F Ravens, defeating Mimic Squadron, sinking the Alicorn, and besting Mihaly A. Shilage in a dogfight while the aforementioned Erusean ace was piloting an X-02S Strike Wyvern.