Yuna and her guardians first encountered Lucil on the Mi'ihen Highroad. She introduced herself as captain of the Chocobo Knights and warned the group of a large fiend in the area with a taste for chocobos. Her group fought with the Crusaders and Al Bhed at Operation Mi'ihen. Another member of the Crusaders participating in the mission described Lucil as "no doubt the best of the bunch" when it comes to the Chocobo Knights. During the mission, Lucil took an active role, directing Yuna and the party to the command center and later leading the charge towards Sin. Following the failed mission that left her ranks in tatters, Lucil tried to re-establish the Chocobo Knights leading up to Lady Yuna's Calm. She first led her group along the Moonflow and then north in search of chocobos to replace the ones they had lost.
During the Calm, she joined the Youth League, along with comrades Elma and Clasko, as an attempt to stifle the reign of New Yevon and build a "new, better Spira." She said that she felt it was her duty. She quickly attained rank of commander amongst the league, second in command only to Nooj. She felt that "the heart is not moved from without; but rather, when the time is right, it moves of its own accord from within" and claimed to have learned all of her wisdom from her troops. In Chapter 5, she came up with the idea to hold a battle tournament as a way for the Youth League troops to blow up steam. If the player chose to give the Awesome Sphere to the Youth League, then the Gullwings were allowed to participate in the battle tournament, with Lucil as the final opponent. Afterward, Lucil gave a rousing speech, speaking on the proper use of power.
Lucil is fought as a boss once in Final Fantasy X-2, as the final opponent in the battle tournament, should the player give the Awesome Sphere to the Youth League.
|Tidus - Auron - Rikku - Wakka - Lulu - Yuna - Kimahri|
|Temporary playable characters|
|Jyscal Guado - Kelk Ronso - Wen Kinoc - Yo Mika|
|Chappu - Clasko - Elma - Gatta - Lucil - Luzzu - Lord Mi'ihen|
|Belgemine - Braska - Dona - Gandof - Isaaru - Ohalland - Yocun - Yunalesca - Zuke|
|Barthello - Biran Ronso - Borra - Brother - Calli - Cid - Ginnem - Jecht - Maechen - Maroda - O'aka XXIII - Omega - Pacce - Rin - Shelinda - Tidus' Mother - Tromell - Wantz - Yenke Ronso - Yu Yevon - Zaon|
|Baaj Temple - Besaid Island - Kilika Island - Luca - Mi'ihen Highroad - Mushroom Rock Road - Djose - Moonflow - Guadosalam - Farplane - Thunder Plains - Macalania - Bikanel Island - Bevelle - Calm Lands - Monster Arena - Cavern of the Stolen Fayth - Remiem Temple - Mount Gagazet - Zanarkand - Zanarkand Dome - Omega Ruins|
|Al Bhed - Guado - Hypello - Ronso|
|Aeon - Blitzball - Butterfly Hunt - Calm - Celestial Weapon - Chamber of the Fayth - Chocobo Knights - Cloister of Trials - Eternal Calm - Fahrenheit - Fayth - Fiend - Final Aeon - Guardian - High Summoner - Hover - Jecht Shot - Machina - Maester - Overdrive - Overdrive Mode - Overkill - Pilgrimage - Pyrefly - Rin's Travel Agency - S.S. Liki - S.S. Winno - Sending - Shoopuf - Sin - Sphere - Sphere Grid - Summoner - Unsent - Warrior Monks - Yevon|
|Original Soundtrack - Promo CD - Suteki da ne - Vocal Collection - Feel/Go Dream: Yuna & Tidus - Piano Collections - Official Soundtrack
|Abilities - Armor - Auto Abilities - Black Magic - Characters - Chronology - Enemies - Enemy Abilities - Items - Locations - Ronso Rage - Translations - Walkthrough - Wallpapers - Weapons - White Magic|
|Yuna - Rikku - Paine|
|Brother - Buddy - Shinra - Barkeep - Biggs and Wedge|
|Auron - Ayde - Baralai - Barthello - Beclem - Benzo - Borra - Calli - Cid - Clasko - Dona - Elma - Garik Ronso - Gippal - Jecht - Kimahri Ronso - LeBlanc - Lenne - Lian - Logos - Lucil - Lulu - Maechen - Marnela - Maroda - Nhadala - Nooj - O'aka XXIII - Ormi - Pacce - Prophet - Rin - Seymour Guado - Shelinda - Shuyin - Tidus - Tobli - Trema - Tromell - Vidina - Wakka - Wantz - Wen Kinoc|
|Besaid - Bevelle - Bikanel - Calm Lands - Cave Ruins - Cavern of the Stolen Fayth - Chocobo Ranch - Coliseum - Den of Woe - Djose - Farplane - Fiend Colony - Guadosalam - Kilika - Luca - Macalania - Mi'ihen Highroad - Mushroom Rock Road - Ruin Depths - Thunder Plains - Via Infinito - Yadonoki Tower - Zanarkand|
|Creatures and Races|
|Al Bhed - Guado - Human - Hypello - Ronso - Cactuar|
|Aeon - Blitzball - Blitzball Tournament - Blue Bullet - Calm - Celsius - Chamber of the Fayth - Chocobo - CommSphere - Creature Create System - Crimson Squad - Dressphere - Episode Complete - Episode Concluded - Eternal Calm - Fayth - Fiend - Game Over - Garment Grid - Gil - Gullwings - Gunner's Gauntlet - High Summoner - Hotspot - Hover - Kinderguardians - LeBlanc Syndicate - Machina - Machine Faction - Maester - Missions - Movie Sphere - New Yevon - Oversoul - Piano - Public Relations - Pyrefly - Rin's Travel Agency - Save Sphere - Shoopuf - Shop - Sphere - Sphere Break - Sphere Break Tournament - Sphere Hunters - The End - Tiny Bee - Unsent - Vegnagun - World Map - Youth League - Zanarkand Abes|
|Original Soundtrack - Eternity ~Memory of Lightwaves~ - Real Emotion/1000 Words - Vocal Collection - Yuna - Vocal Collection - Rikku - Vocal Collection - Paine - International Last Mission Original Soundtrack - Piano Collection
|Accessories - Blue Bullet - Chronology - Dresspheres - Enemies - Enemy Abilities - Items - Merchandise - Spells - Walkthroughs - Wallpapers|