Gallagher — Honkai Star Rail Character Guide

Overview

Offensive healer applying Besotted debuff that heals allies when they attack afflicted enemies. Enhances Break DMG received and scales healing with Break Effect. Best 4-star sustain with exceptional Super Break and HP fluctuation synergy.

Offensive Abundance healer whose core mechanic is the Besotted debuff applied via Ultimate. Besotted enables passive healing — allies restore HP whenever they attack a Besotted enemy — and increases Break DMG taken. Gallagher cycles his 110-Energy Ultimate rapidly thanks to his A4 trace granting 100% Action Advance after Ultimate, then immediately follows up with Enhanced Basic ATK (Nectar Blitz) for massive single-target Toughness damage and an ATK reduction debuff.

Key Mechanics

• All healing is flat (no HP/ATK scaling) — Outgoing Healing from A2 trace (Break Effect conversion) is the only way to scale healing output. At 150% Break Effect with Outgoing Healing body piece, total healing is more than doubled.
• Besotted healing triggers per-hit per-enemy — multi-hit attacks (Feixiao, Topaz follow-ups) and AoE attacks against multiple Besotted enemies trigger multiple 640 HP restores, giving Gallagher exceptionally high healing throughput in multi-target scenarios.
• Nectar Blitz deals 90 Toughness damage (30 base) plus Ultimate's 60 AoE Toughness, totaling 150 single-target Toughness in one rotation — unheard of for a sustain unit. Combined with Fire element Break (highest immediate Break DMG), Gallagher contributes significant offensive utility.
• Besotted is tied to a 2-turn debuff on enemies (3 with E4). Fast-acting enemies can shed the debuff between Gallagher turns, completely stopping passive healing. SPD investment (134+ minimum, 143/160 recommended) is critical for maintaining uptime.
• Provides 2 debuffs rapidly (Besotted + ATK reduction from Nectar Blitz), making him synergistic with debuff-counting characters like Acheron and enabling Pioneer Diver of Dead Waters relic set for allies.

Best DPS Pairings

Firefly (S), March 7th • The Hunt (S), Archer (A), Castorice (A), Kafka (A), March 7th • Evernight (A), Mydei (A), Himeko (A), Moze (A), Luka (A), Sushang (A), Xueyi (A)

Investment Priority

1. E2 — Transforms Skill into cleanse bot with 30% Effect RES buff for 2 turns. Critical for debuff-heavy content (Imprisonment, Freeze, Entangle). Stacks with E1 for 80% total Effect RES, making CC nearly irrelevant.
2. LC S1 — Signature provides 60% Break Effect maxing A2 conversion at S1. Scent Alone's Vulnerability debuff amplifies all team damage. Gap to F2P options like What Is Real narrows significantly with Besotted.
3. E4 — Extends Besotted from 2 turns to 3 turns (50% uptime improvement). Dramatically reduces SPD requirements and enables consistent healing even at 134 SPD. Game-changing QoL for comfortable gameplay.
4. E1 — Regenerates 20 Energy at battle start and grants 50% Effect RES permanently. Strong entry bonus enabling faster first Ultimate uptime.

Best Relics

Recommended: passerby-of-wandering-cloud + messenger-traversing-hackerspace with forge-of-the-kalpagni-lantern

Stat targets: Break Effect 150%+, SPD 134-160

Main stats: Body: Healing Boost · Feet: SPD · Sphere: HP% / DEF% · Rope: Energy Regen

Important Notes

• Besotted debuff has 2-turn base duration (3 with E4) - fast enemies can cleanse it quickly between Gallagher turns
• Requires 134+ SPD minimum to maintain reasonable Besotted uptime. 143/160 breakpoints recommended for competitive play
• Healing is entirely tied to Besotted debuff - if enemies cleanse frequently or Gallagher is CC'd, healing stops completely
• A6 AoE heal only triggers when enhanced Basic hits Besotted enemy - plan Ultimate timing to ensure Besotted is active
• Break Effect requirement (150% for max A2 conversion) can conflict with defensive stats - may be squishy without good substats
• Not the best sustain choice for pure hypercarry teams that don't leverage Break or debuffs - Aventurine/Huohuo typically better