Gallagher 
Abundance A security officer of the Bloodhound Family at Penacony. He is always courteous toward visiting guests but keeps his vigilance about him. He seems to carry a weight of a complicated past, yet he never voluntarily divulges any details.
HP
ATK
DEF
SPEEDBreak Effect Healer Build
Best Light Cone
Gallagher Best Stats
Gallagher Best Substats
Gallagher Best Relics
Gallagher Best Ornaments
Forge of the Kalpagni Lantern
Talia: Kingdom of Banditry
Giant Tree of Rapt Brooding
Gallagher Best Teams
Gallagher + March 7th (Imaginary)
Gallagher acts as the team healer and applies Besotted; he heals an ally when that ally attacks a Besotted enemy. March 7th is the main Break DPS while Harmony Trailblazer and Asta provide Break Effect and SPD/ATK buffs to boost Break damage and turn order.
Gallagher + Firefly + Fugue + The Dahlia
A Break-focused comp where Fugue and The Dahlia push Break Effect for higher Break damage. Gallagher provides heals and Besotted interactions to sustain and enable follow-ups on broken enemies.
Gallagher + Acheron + Jiaoqiu + Pela
Utility/sustain comp for DPS that scale off debuffs. Gallagher's Besotted and heals help Acheron and similar DPS ramp damage (and increase chances for follow-up mechanics). Good when pairing with supports that restore energy or apply DOTs.
Gallagher + Castorice + Trailblazer (Ice) + Tribbie
Sustain-focused comp where Gallagher keeps Castorice healthy to maximize uptime and Memosprite healing; Trailblazer (Ice) and Tribbie provide complementary support/utility.
Gallagher + Himeko + Topaz + Silver Wolf
Designed for content where enemy is Quantum-weak but lacks Fire weakness. Silver Wolf implants Fire weakness so Himeko (or a Fire DPS) can deal high damage; Gallagher provides sustain and Besotted interactions.
Skills
Deals Fire DMG equal to #1[i]% of Gallagher's ATK to one designated enemy target.
Immediately heals a target ally for #1[i] HP.
Inflicts Besotted on all enemies, lasting for #2[i] turn(s). At the same time, deals Fire DMG equal to #1[i]% of Gallagher's ATK to all enemies, and enhances his next Basic ATK to Nectar Blitz.
The Besotted state makes targets receive #1[f1]% more Break DMG. Every time a Besotted target gets attacked by an ally, the attacking ally's HP is restored by #2[i].
Break DMG increases with higher Break Effect, higher target max Toughness, and higher character levels. Break DMG cannot CRIT Hit and is not affected by DMG Boost effects.
Traces
Eidolon
When entering the battle, Gallagher regenerates
When using the Skill, dispels
Debuffs are negative status effects that render units weaker. Unless otherwise specified, debuffs can be dispelled.
Skill Lv. +2, up to a maximum of Lv.
Extends the duration of the Besotted state inflicted by Gallagher's Ultimate by
Ultimate Lv. +2, up to a maximum of Lv.
Increases Gallagher's Break Effect by