Dr. Ratio Guide and Best Builds

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Introductions

Dr. Ratio is a 5-Star character with the Imaginary element who follows the Path of The Hunt. Dr. Ratio is a single target DPS specialising in Follow-Up ATKs in addition to being able to self buff his CRIT Rate and CRIT DMG while providing debuffs such as SPD reduction and lowering enemy Effect RES. This makes Dr. Ratio very capable in teams that consist of allies who provide many debuffs to suit his Follow-Up ATK playstyle.
Our Dr. Ratio Build Guide will show you the best Light Cones, Relics, and team compositions to help you build the best Dr. Ratio.

Dr. Ratio's Best Light Cone

Listed below are the Light Cones we recommend for Dr. Ratio.

Baptism of Pure Thought
S1

Increases the wearer's CRIT DMG by 20.0 / 23.0 / 26.0 / 29.0 / 32.0%. For every debuff on the enemy target, the wearer's CRIT DMG dealt against this target additionally increases by 8.0 / 9.0 / 10.0 / 11.0 / 12.0%, stacking up to 3 times. When using Ultimate to attack the enemy target, the wearer receives the "Disputation" effect, which increases DMG dealt by 36.0 / 42.0 / 48.0 / 54.0 / 60.0% and enables their Follow-Up ATKs to ignore 24.0 / 28.0 / 32.0 / 36.0 / 40.0% of the target's DEF. This effect lasts for 2 turns.

Sources: Event Warp (limited)

Baptism of Pure Thought is Dr. Ratio's best-in-slot Light Cone, providing everything he wants. It is particularly effective in teams that can consistently apply multiple debuffs, allowing him to maximise its CRIT DMG bonus. His Ultimate also boosts his DMG and lets his Follow-Up ATKs ignore enemy DEF, making his already powerful Follow-Up ATKs even stronger.

The Finale of a Lie
S1

Increases the wearer's CRIT Rate by 18.0 / 21.0 / 24.0 / 27.0 / 30.0%. At the start of battle or for every 4.0 instance(s) of Follow-Up ATK the wearer uses, the wearer gains "Umbra Devourer," lasting for 3.0 turn(s). While the wearer holds "Umbra Devourer," increases ATK by 40.0 / 50.0 / 60.0 / 70.0 / 80.0% and increases the DMG taken by all enemies by 20.0 / 22.5 / 25.0 / 27.5 / 30.0%. Effects of the same type cannot stack.

An alternative to Baptism of Pure Thought that provides valuable CRIT Rate while improving his damage as he consistently performs Follow-Up ATKs, making it a good fit for his Follow-Up ATK-focused style.

Worrisome, Blissful
S1

Increase the wearer's CRIT Rate by 18.0 / 21.0 / 24.0 / 27.0 / 30.0% and increases DMG dealt by Follow-Up ATK by 30.0 / 35.0 / 40.0 / 45.0 / 50.0%. After the wearer uses a Follow-Up ATK, inflicts the target with the "Tame" state, stacking up to 2 time(s). When allies hit enemy targets under the "Tame" state, each "Tame" stack increases the CRIT DMG dealt by 12.0 / 14.0 / 16.0 / 18.0 / 20.0%.

Sources: Event Warp (limited)

Worrisome Blissful provides valuable CRIT Rate and Follow-Up ATK DMG while also supplying a debuff he can directly benefit from, making it particularly useful for improving both his consistency and damage.

Cruising in the Stellar Sea
S5

Increases the wearer's CRIT Rate by 8.0 / 10.0 / 12.0 / 14.0 / 16.0%, and increases their CRIT Rate against enemies with HP percentage 50.0% or less by an extra 8.0 / 10.0 / 12.0 / 14.0 / 16.0%. When the wearer defeats an enemy, their ATK is increased by 20.0 / 25.0 / 30.0 / 35.0 / 40.0% for 2 turn(s).

Sources: Herta's Store

A free-to-play option for Dr. Ratio providing CRIT Rate and works particularly well in content where enemies frequently fall below 50% HP, allowing him to make consistent use of its additional bonus.

Only Silence Remains
S5

Increases the wearer's ATK by 16.0 / 20.0 / 24.0 / 28.0 / 32.0%. If there are 2 or fewer enemies on the field, increases wearer's CRIT Rate by 12.0 / 15.0 / 18.0 / 21.0 / 24.0%.

Sources: Stellar Warp

A useful 4-Star option when fighting smaller groups of enemies, where Dr. Ratio can reliably benefit from its CRIT Rate bonus. Its value decreases in larger groups where the condition becomes harder to maintain.

Best Relics and Planar Ornaments for Dr. Ratio

Best Relics for Dr. Ratio

These are the best Relic sets for Dr. Ratio.

Pioneer Diver of Dead Waters

2-Piece Set: Increases DMG dealt to enemies with debuffs by 12.0%.

4-Piece Set: Increases CRIT Rate by 4.0%. The wearer deals 8.0%/12.0% increased CRIT DMG to enemies with at least 2/3 debuffs. After the wearer inflicts a debuff on enemy targets, the aforementioned effects increase by 100%, lasting for 1 turn(s).

The best relic set for Dr. Ratio, providing additional CRIT DMG when there are 2–3 debuffs on enemies. Dr Ratio can apply debuffs himself through his bonus trace for the sets increased effects. He prefers allies who can consistently apply debuffs to enemies, both to activate his relic effects and to improve the consistency of his Follow-Up ATK.

Wastelander of Banditry Desert

2-Piece Set: Increases Imaginary DMG by 10.0%.

4-Piece Set: When dealing DMG to debuffed enemy targets, the wearer has their CRIT Rate increased by 10.0%. And when they deal DMG to Imprisoned enemy targets, their CRIT DMG increases by 20.0%.

Increases his Imaginary DMG while increasing his CRIT Rate when attacking debuffed enemies. This ensures an almost permanent CRIT Rate buff.

Musketeer of Wild Wheat

Scholar Lost in Erudition

2-Piece Set: Increases ATK by 12.0%.

4-Piece Set: The wearer's SPD increases by 6.0% and DMG dealt by Basic ATK increases by 10.0%.

2-Piece Set: Increases CRIT Rate by 8.0%.

4-Piece Set: Increases DMG dealt by Skill and Ultimate by 20.0%. After using Ultimate, additionally increases the DMG dealt by the next Skill by 25.0%.

Outside of his best 4-piece options, you can also pair a 2-piece ATK % with a 2-piece set such as , , or depending on what stats you need.

Best Planar Ornaments

Duran, Dynasty of Running Wolves

2-Piece Set: When an ally character uses a Follow-Up ATK, the wearer gains 1 stack of "Merit," stacking up to 5 time(s). Each stack of "Merit" increases the DMG dealt by the wearer's Follow-Up ATKs by 5.0%. When there are 5 stacks, additionally increases the wearer's CRIT DMG by 25.0%.

Duran is one of the best options available for Dr. Ratio thanks to his Follow-Up ATK-focused play, allowing him to build its stacks consistently and gain substantial benefits over the course of a fight.

Izumo Gensei and Takama Divine Realm

2-Piece Set: Increases the wearer's ATK by 12.0%. When entering battle, if at least one teammate follows the same Path as the wearer, then the wearer's CRIT Rate increases by 12.0%.

Izumo is a more team-dependent option for Dr. Ratio, requiring another Hunt character in the team to unlock its full value but nonetheless is a great option. It can be particularly useful when his team already naturally includes another Hunt character.

Firmament Frontline: Glamoth

2-Piece Set: Increases the wearer's ATK by 12.0%. When the wearer's SPD is equal to or higher than 135/160, the wearer deals 12.0%/18.0% more DMG.

Firmament Frontline: Glamoth is a great option for Dr. Ratio, providing ATK and additional DMG when he reaches its SPD requirements. It works well as his build generally wants 135 SPD without sacrificing his other important stats.

Dr. Ratio's Stat Priority

Body

CRIT Rate

CRIT DMG

Feet

SPD

ATK%

Planar Sphere

ATK%

Imaginary DMG Boost

Link Rope

ATK%

Stat Priority

CRIT Rate

CRIT DMG

ATK%

SPD

Recommended Endgame Stats for Dr. Ratio

3000+

DEF

1200+

ATK

3000+

SPD

135+

CRIT DMG

140%

CRIT Rate

70%

Traces Priority

Skills Priority

Talent > Skill > Ultimate > Basic

Major Traces Priority

Summation > Deduction > Inference

Dr. Ratio Build Comments

Character Overview Kit Overview Team Synergy

Character Overview

Dr. Ratio does best at defeating high HP targets through his frequent Follow-Up ATKs. While his Skill and Ultimate deal decent single-target damage, the majority of his output comes from repeatedly triggering his Talent, making him a strong sustained Follow-Up ATK damage dealer.

Dr. Ratio’s gameplay revolves around attacking enemies inflicted with debuffs. The more debuffs a target has, the more consistently he can trigger his Follow-Up ATK, while also benefiting from additional damage bonuses and permanent CRIT stat increases throughout the battle. Once the required debuff threshold is met, his rotation becomes more consistent, allowing him to deal reliable damage while generating Energy.

Although he remains primarily focused on single-target encounters, his Follow-Up ATKs can still target another enemy if the original target is defeated, helping him maintain pressure across multi-wave fights. With the right team supporting his debuff requirements, Dr. Ratio offers excellent sustained damage and remains a dependable choice against bosses and elite enemies.

Kit Overview

Dr. Ratio's Skill deals single-target Imaginary damage and serves as the primary trigger for his Talent. After using his Skill, he has a chance to perform a powerful Follow-Up ATK, with the activation chance increasing based on the number of debuffs affecting the target. At three debuffs, this Follow-Up ATK becomes guaranteed, making consistent debuff application a core part of his gameplay.

His Ultimate deals single-target damage and marks an enemy with Wiseman's Folly. While this mark is active, allied attacks against the marked target cause Dr. Ratio to launch additional Follow-Up ATKs outside of his turn, allowing him to continue dealing damage even when he is not actively taking actions.

Dr. Ratio's Bonus Abilities further reinforce this playstyle. He permanently gains CRIT Rate and CRIT DMG by repeatedly attacking debuffed enemies, can inflict a small Effect RES reduction to help maintain debuff uptime, and receives a significant damage bonus against heavily debuffed targets. Together, these effects enable Dr. Ratio to maximise both his damage and Follow-Up ATK frequency. Be careful not to add too much CRIT Rate when building his kit though as this will provide no additional benefit if he over caps during battle.

Team Synergy

Dr. Ratio performs best alongside teammates who can consistently apply multiple debuffs. Reaching at least three debuffs on an enemy is one of the most important requirements in his kit, as it guarantees his Talent's Follow-Up ATK after every Skill use. Additional debuffs also increase the damage he deals, making dedicated debuffers extremely valuable.

Characters like Silver Wolf, Jiaoqiu and Pela are excellent partners thanks to their ability to maintain debuffs while also increasing the team's overall damage. Topaz is another standout teammate, as her Follow-Up ATK synergy significantly enhances Dr. Ratio's overall performance, though additional debuff support may still be required depending on her build.

Dr. Ratio's Best Teams

To learn all about Dr. Ratio's synergies and best team compositions, check out our dedicated Dr. Ratio team page below:

Dr. Ratio Teams

Dr. Ratio's Best Eidolons

E6 – One of Dr. Ratio's most impactful Eidolons, it increases his Wiseman's Folly count by 1, allowing him to trigger an additional Follow-Up ATK. It also increases the DMG of his Follow-Up ATKs by 50%, resulting in a substantial boost to his overall damage output.
E2 – A powerful damage boost that adds extra Imaginary DMG to every Follow-Up ATK based on the target's debuffs. In teams that consistently apply multiple debuffs, this effect frequently reaches its maximum of four triggers, making it one of Dr. Ratio's strongest damage increases.
E4 – Each time Dr. Ratio's Talent is triggered, he regenerates 15 Energy for himself, allowing him to use his Ultimate more frequently. As Dr. Ratio's Ultimate has a high Energy cost, this is highly beneficial for him.
E1 – Expands Summation's maximum stack count by 4 and instantly provides all four stacks at the start of battle. This removes the need to build stacks over time, letting Dr. Ratio access the Trace's full damage potential right from the start.

Holster

Guide Author

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Holster is a passionate gacha gamer who spends her time exploring the worlds of Genshin Impact and Honkai: Star Rail. Whether she's pulling for her favorite characters, building new team comps or exploring what the game has to offer.