Trigger is a male Osean Air Defense Force pilot, part of the LRSSG and former member of Mage Squadron. Following his alleged murder of former Osean President Vincent Harling, he was assigned to the OADF's penal unit, Spare Squadron. He later becomes a member of Strider Squadron in the LRSSG.
He is the player character in Ace Combat 7: Skies Unknown. His personal emblem is an orange-haired wolf clutching a revolver in its jaws.
Sometime before the Lighthouse War, Trigger was transferred to Mage Squadron and given the designation Mage 2.
On May 30, 2019, as a member of Mage Squadron, he aided in trying to secure air superiority over the Chopinburg Rainforest during Operation Dual Wielder. Osean aircraft were almost successful in obtaining air superiority, however, Erusea utilized an Arsenal Bird to regain control of the airspace quickly. Following this, both Mage and Golem squadrons were tasked with covering their allies' retreat.
On June 6, 2019, after navigating through the Erusean's radar to attempt to save the former President of Osea, Vincent Harling and engaging with many UAVs sent from a nearby Arsenal Bird, Trigger allegedly killed the former president in the chaos. This incident resulted in him being reassigned to a penal unit (Spare Squadron). The severity of the alleged crime earned him three 'sin lines' as part of his aircraft marking.
On July 4, 2019, now as a member of Spare Squadron, he participated in Operation One Pair. During the operation, Spare was tasked with crippling an Erusean base situated in Roca Roja before the main forces arrived. Through eliminating a large number of Erusean forces, Trigger proved to be quite a valuable asset to Osea. However, following the loss of a substantial amount of troops, the Erusean military reinforced the base with squadrons of MQ-99s.
Eight days later, Trigger participated in Operation Two Pairs, assisting both Cyclops and Strider squadrons retreat from Yinshi Valley. When members of Sol Squadron arrived to complicate things, Trigger was assigned to take Mihaly head on. After dogfighting him for a while and losing a few pilots to the advanced skills of Sol's pilots, Sol retreated for unknown reasons, with the remaining members of Spare able to escort Cyclops and Strider back to their base safely.
After a few more successful missions with Spare, involving even escorting the base commander D.McKinsey to friendly territory, Trigger was transferred to the Long Range Strategic Strike Group. He became the leader of Strider Squadron, working with Cyclops Squadron to launch a counterattack on the Erusean military. Following his transfer, Trigger, at some point, had the three sin lines on his tail turned into three claw scratches. He quickly gains a reputation as "Three Strikes," often demoralizing enemy troops.
As leader of Strider Squadron, Trigger led during a raid on the Erusean Navy at Snider's Top and assisted in the defense of Stonehenge while Osean technicians repaired it to shoot down an Arsenal Bird. He would then play a critical role in destroying the Erusean nuclear capabilities by guiding bombers in destroying Erusean missile silos. Trigger would also lead Strider Squadron in assisting the capture of an Erusean air base at Cape Rainy.
Trigger and Strider Squadron's presence at the Battle for Farbanti would play a crucial role in securing Osean victory, with his presence demoralizing Erusean moral and Trigger themselves doing extreme damage to the city's defence. This would, however, change with the arrival of Sol Squadron, who in the resulting dogfight shot down Cyclops' commanding officer Wiseman before the fight would end without a victor after Sol Squadron withdrew following the destruction of the satellite network.
Strider Squadron would then assist in the efforts of Operation Gorgon, which was to escort an Erusean general - Édouard Labarthe - to Osean territory, although it ended in disaster by an apparent friendly fire incident. However, before the death of the Erusean general, he revealed Trigger was not wholly responsible for the death of ex-President Vincent Harling, but rather by an Erusean Drone faking an Osean IFF using Belkan technology. 
Running low on supplies and having no orders, the LRSSG would attempt to join with Spare Squadron at Tyler Island only to discover that the Osean invasion of the island had been a disaster. Despite the chaos, Trigger was able to assist in providing cover for the evacuations, personally defending the position marked by Princess Rosa Cossette D'Elise before shooting down two resupply ships that were to be used to resupply and upgrade the final Arsenal Bird. While these actions themselves were successful, it did not solve the problems of the LRSSG.
In desperation, the LRSSG assaulted Shilage Castle in hopes of stealing needed supplies. This confrontation would result in one final battle with Sol Squadron. During the dogfight, Mihaly revealed that he was quite impressed with Trigger's skill and decided to 'test' the pilot in a one on one dogfight. After Trigger successfully shot down Mihaly, Mihaly requested that Trigger put a stop to the drone production before his plane exploded.
During the final stages of the war, Trigger played a crucial role in taking down the other Arsenal Bird and destroying the pair of ADF-11Fs attempting to upload the new data obtained through Mihaly fighting Trigger and drag on the war forever. One drone managed to escape and Trigger chased it down through the undersea tunnels. After Trigger managed to shoot it down at the bottom of the space elevator, Trigger escaped the space elevator by flying vertically through its windbreak and rejoined the rest of Strider Squadron and the remaining Osean and Erusean aircraft.
- Trigger's emblem is an homage to Air Combat 22, where the Aces squadron emblem features an animal holding a revolver in its mouth.
- A reflection of trigger can be seen during the briefing for Transfer Orders. In the briefing, McKinsey dismisses the pilots, then calls Trigger back. A figure can then be seen in the reflection of the briefing panel turning around and facing the screen as everyone else leaves, though a message appearing on the screen obscures his features.
- Judging by the reflection, Trigger appears to be a male of average height and build.
- This makes him the third player character from the Strangereal continuity to be seen outside of gameplay, after Blaze from Ace Combat 5: The Unsung War and Phoenix from Ace Combat: Assault Horizon Legacy. Like Blaze and Phoenix, only his body is seen, with his face being obscured.