Dr. Ratio
Who is Dr. Ratio?
Dr. Ratio is a 5★ Imaginary Hunt follow-up attack DPS and a haughty scholar who holds his allies to impossibly high intellectual standards. His kit is entirely reliant on enemy debuff stacks — his Talent triggers a powerful Imaginary follow-up attack whenever he hits a debuffed enemy, dealing bonus additional damage for each debuff present (up to 4 triggers per follow-up). Silver Wolf and Topaz are his best partners for stacking debuffs efficiently. While power-crept from his debut T0 status, he remains a free-to-play-friendly Hunt carry whose accessibility makes him still worth building.
Kit Summary
Deals Imaginary DMG with a high chance to inflict Wiseman's Folly — enemies afflicted take a follow-up from another ally.
Deals Imaginary DMG to a single target and inflicts debuffs that reduce Imaginary RES.
After any ally attacks a target that Dr. Ratio has hit, 40% chance to trigger a follow-up; the follow-up deals extra DMG for each debuff on the enemy (max 4 procs).
Inflicts Wiseman's Folly on the first enemy before combat.
Build Guide
🔮 Best Relic / Echo Set
The Ashblazing Grand Duke (4pc) — ATK stacking per follow-up hit accelerates rapidly given his talent triggers. Planar: Duran, Dynasty of Running Wolves — stacking DMG% bonus for FUA teams.
⚔ Best Light Cone / Weapon
Signature: Baptism of Pure Thought — CRIT DMG and Imaginary DMG bonus that increases with each debuff on the enemy. F2P: Cruising in the Stellar Sea (5★ standard Hunt) — CRIT Rate and ATK% bonus; Sleep Like the Dead (5★ standard) for high CRIT DMG.
📊 Substats Priority
👥 Best Teams
Debuff FUA: Dr. Ratio + Silver Wolf + Topaz & Numby + Aventurine (debuff stacking for full talent procs)
Classic: Dr. Ratio + Robin + Topaz & Numby + Aventurine (FUA quad)
F2P Verdict
Dr. Ratio is obtainable for free via the Ember Exchange shop — no banner pulls required. This makes him one of the most accessible 5★ carries in the game. His signature is a notable upgrade but Cruising in the Stellar Sea (standard) works well. Build at least 3 external debuffs to maximise his talent trigger rate.
Frequently Asked Questions
Is Dr. Ratio free to obtain?
Yes — Dr. Ratio can be obtained permanently through the Ember Exchange shop using Undying Embers, requiring no banner pulls. He is effectively a free 5★ Hunt carry for all players.
How many debuffs does Dr. Ratio need?
He needs at least 1 debuff (his own Wiseman's Folly counts) to trigger his follow-up, but his bonus damage scales up to 4 debuffs on the target. Silver Wolf can stack multiple debuffs with one Skill use, enabling his full potential.
Is Dr. Ratio still worth building in 4.2?
Yes, especially since he is free. He is outperformed by Feixiao in the FUA Hunt slot but remains a solid choice for players without premium Hunt characters. Debuff stacking is key to his performance.