Best Honkai Star Rail Dr Ratio Build

UPDATE 12/12/2024: We have updated this page with additional information on the best Light Cones and Relics for Dr Ratio, and have added a new section on the best team compositions for the 5-Star character.

The best Honkai: Star Rail Dr Ratio build is flexible enough to work with several Light Cones and a few interesting Relic options, thanks in part to Dr Ratio's unique kit and follow-up attacks.

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Our Honkai Star Rail Dr Ratio build guide breaks down how to bring out the best in the Genius Society member. Check out our Dr Ratio materials list and Dr Ratio kit explainer if you need to brush up on more about the 5-star Imaginary character.

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Best Honkai Star Rail Dr Ratio Build

Dr Ratio is a 5-Star character from the Path of the Hunt that uses the Imaginary element.

• Dr Ratio Light Cone
• Dr Ratio Relics
• Dr Ratio Ornaments
• Dr Ratio Substats
• Dr Ratio Teams
• Should I pull for Dr Ratio?

Dr Ratio shares some important traits with other Hunt characters, with a twist that’s uniquely his. Dr Ratio’s skill targets one enemy and his ultimate targets one enemy, so the best thing you can do for him is raise his critical hit rate and damage. Where things get different is with his follow-up attacks. His ultimate applies an effect that launches a follow-up attack when anyone hits the marked foe, and his talent gives him a fixed chance of launching follow-ups on multiple enemies depending on how many debuffs they have.

Honkai Star Rail – Best Dr Ratio Light Cone

5-Star Dr Ratio Light Cones

Dr Ratio’s signature Light Cone Baptism of Pure Thought is almost stupidly good. It raises the wearer’s critical damage by 20/32 percent outright and for every debuff the target enemy has, the wearer deals an additional 8/12 percent critical damage.

That debuff augment can stack up to three times. Then, when the wearer uses their ultimate, the cone applies a Disputation effect, which raises the wearer’s damage by 36/60 percent and ignores 24/40 percent of the enemy’s defense. That’s a lot of damage, but it’s also a limited Light Cone, so not everyone can make that work.

My top pick for a replacement 5-star Light Cone is Crusing in the Stellar Sea, which you can get for eight Herta Bonds in the Simulated Universe store. This one raises the wearer’s critical hit rate by eight to 16 percent, and if the target foe has less than 50 percent health, the user’s crit rate goes up a further eight to 16 percent. Once the wearer defeats an enemy, they get a 20/40 percent attack buff for two turns.

The handy thing about using this one is that, over time, you can get the materials to reach superimposition level five by spending more Herta Bonds at the store.

Last, but not least, another viable 5-Star Light Cone for Dr Ratio is Worrisome, Blissful. This Light Cone increases the wearer's crit rate by 18/30 percent and increases the damage of all follow-up attacks by 30/50 percent, which is huge for Dr Ratio's kit. On top of that, this Light Cone applies a stack of Tame every time an enemy is hit with a follow-up attack (up to two stacks), and when Dr Ratio - or an ally - hits an enemy afflicted by Tame, their crit damage dealt will be increased by 12/20 percent.

4-Star Dr Ratio Light Cones

Dr Ratio’s kit makes finding a good 4-star Light Cone a bit difficult, but he has a few options. One is Dan Heng’s cone, Only Silence Remains, which raises the user’s attack by 16/32 percent and boosts their critical rate by 12/24 percent when only one or two enemies are on the field.

Return to Darkness is decent on him as well, but mainly as a last resort. It gives a 12/24 percent critical rate buff and has a chance of dispelling a buff on an enemy when you land a critical hit – handy, if you don’t have someone like Pela or Luocha on your team.

3-Star Dr Ratio Light Cones

Your best 3-star Dr Ratio Light Cone is Darting Arrow. It increases the wearer’s attack by 24/48 percent when they defeat an enemy, and Dr Ratio’s more than likely going to be the one defeating enemies in any party he’s in. Since it’s a 3-star cone, you also have a pretty good chance of acquiring plenty of them just by spending Jade earned in events.

Honkai Star Rail – Best Dr Ratio Relics

Dr Ratio has a few Relic options that fit specific parts of his kit, or you could mix and match to suit your tastes.

Wastelander of Banditry Desert is one of the best-in-slot choices for Dr Ratio, and it does the following:

• Two-piece effect: Raises Imaginary damage by 20 percent,
• Four-piece effect: Raises wearer’s crit rate by 10 percent against debuffed enemies and buffs crit damage by 20 percent against Imprisoned enemies,

The critical rate buff is nice, especially if you don’t get Dr Ratio’s Light Cone, but the critical damage boost is hit-and-miss. It’s only effective in a scenario where enemies have Imaginary weakness, and you stand a chance of breaking them frequently. Consider holding off on this set except in Forgotten Hall or Pure Fiction stages Imaginary weakness may be common.

An alternative set of Relics is the Ashblazing Grand Duke set.

• Two-piece effect: Increases follow-up attack damage by 20 percent,
• Four-piece effect: Raises the wearer’s attack by six percent every time a follow-up attack hits. The effect lasts for three turns, can stack eight times, and resets when the user lands another follow-up attack.

What I like about this set is its flexibility. More damage from Ratio’s follow-ups is always a good thing, and even if your party can’t inflict debuffs for constant follow-ups, he still benefits from the attack buff that his last follow-up generated.

Last, but not least, a third set you can consider for Dr Ratio - and arguably, the best - is the Pioneer Diver of Dead Waters. This set provides the following:

• Two-piece effect: Increases crit damage to enemies with a debuff by 12 percent.
• Four-piece effect: Increases crit rate by 4 percent. The wearer deals 8 or 12 percent increased crit damage to enemies with 2 or 3 debuffs respectively, and after the wearer inflicts a debuff, their increased damage values increased by 100% for one turn.

Considering a good Dr Ratio build and team will revolve around consistently debuffing enemies and launching follow-up attacks, the Pioneer Diver set provides him the most value overall.

Honkai Star Rail – Best Dr Ratio Ornaments

Dr Ratio’s best ornament set is Duran, Dynasty of Running Wolves, which helps Dr Ratio get even more out of his follow-up attacks.

With it equipped, Dr Ratio will receive one stack of Merit every time he, or an ally, launches a follow-up attack (stacking up to five times). Each stack of Merit that Dr Ratio then has will increase the damage dealt by his follow-up attacks by 5%. If he reaches five stacks of Merit, his crit damage is also increased by 25%.

An alternative to this Ornament set is Inert Salsotto. It gives a small critical rate buff, and when the wearer’s crit rate is at 50 percent or higher, you get a 15 percent buff for your ultimate and follow-up attacks.

Last, but not least, if you are accompanying Dr Ratio with another character from the Path of the Hunt, then it's worth considering the Izumo Gensei and Takama Divine Realm set. It increases Dr Ratio's attack by 12 percent, but if he also enters battle with another Hunt character, his crit rate will be increased by 12 percent too.

Honkai Star Rail - Best Dr Ratio Substats

Dr Ratio’s Relic stats should be pretty familiar if you’ve built other Hunt characters.

• Body: Crit rate or crit damage
• Feet: Attack percent or speed
• Sphere: Attack or Imaginary damage
• Link Rope: Attack or energy regen

If you have attack on feet and sphere, I’d recommend going for energy regen on your rope. Dr Ratio’s ultimate deals a hefty amount of damage and guarantees two follow-up attacks, so firing it off frequently is a good idea.

For substats, any of the main stats would work, but you’ll also want to give a thought to defense. Hunt characters are fragile, and while a good healer or shielder can keep them alive, buffing their defense a little certainly makes the job easier.

Honkai Star Rail - Best Dr Ratio Teams

For a Dr Ratio team, the Imaginary character acts as your primary DPS, so you'll want to team him up with characters that will amplify his abilities - namely, his follow up attacks - and at least one support character who can heal or sustain the team.

• Dr Ratio
• Topaz
• Robin
• Aventurine

Robin acts as one of the best support characters to accompany Dr Ratio, given that her kit allows her to increase the attack damage and crit damage of her allies. On top of that, Robin's Ultimate puts her into Concerto State, triggering all other allies to take action, thus providing Dr Ratio and co. with plenty more time to attack (and launch follow-ups!).

Topaz is another great character for a Dr Ratio team, with her being able to debuff enemies - something that Dr Ratio requires to make the most of his kit. She can also summon an adorable Trotter who's capable of launching their own follow-up attacks, which works well with not just Dr Ratio, but Robin too. That said, you could consider swapping Topaz for some more free-to-play friendly options such as Moze, March 7th: The Hunt, or Pela.

Bronya's ability to boost the crit damage and rate of her team also makes her great alongside Dr Ratio.

Your sustenance/healer slot could go to any strong healer character that you're a fan of, but one of the best to accompany Dr Ratio is Aventurine. Aventurine offers fantastic shielding for the party, but also launches his own follow-up attacks as part of his talent, Shot Loaded Right. Similarly, Lingsha is a great option thanks to her talent, Mistdance Manifest, and Bonus Trace, Ember's Echo.

Should I pull for Dr Ratio in Honkai Star Rail?

Dr Ratio is acquired for free as part of the story in Honkai Star Rail, and while his Eidolons are helpful - especially his first Eidolon - they aren't essential. We recommend saving your Stellar Jade for a future character!

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If you're wondering who else to pair with Dr Ratio, check out our Honkai Star Rail tier list, and head over to our Star Rail codes page for some freebies to help with your next pull.

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