Honkai Star Rail’s Dr. Ratio – yes, that’s really his name – is now a member of the playable roster. He’s a follower of the Hunt path and is an Imaginary-using five-star unit. I’m too old to make a ratio-based joke here, but I feel like his hand making an L-shape in his splash art is on purpose.
If you want to stock up on stellar jades, grab all the latest Honkai Star Rail codes right here, and check out our Honkai Star Rail tier list to see who we think are the best characters in the game.
Here is everything you need to know to get a great Honkai Star Rail Dr. Ratio build.
Honkai Star Rail Dr. Ratio release date
Hoyoverse will release Dr. Ratio in the second half of version 1.6. He releases in the same update as Honkai Star Rail’s Xueyi and Honkai Star Rail’s Ruan Mei.
Also, players automatically get a free copy of him as a thank-you for Honkai Star Rail winning awards at The Game Awards 2023, Google Play awards, and more.
What do we know about Honkai Star Rail Dr. Ratio’s build?
Would you look at that – Dr. Ratio is yet another tall, male, Imaginary, five-star character. We can now have a full team of them! Anyway, he follows the path of the Hunt, which means he deals in single target damage akin to Honkai Star Rail’s Yanqing and Honkai Star Rail’s Dan Heng.
What are the best light cones for Dr. Ratio?
Alongside his release, Dr. Ratio will get his own signature five-star light cone which is tailored to his kit. There are some other great options for him, though, which we’ve listed below.
| Light Cone | Effect | How to obtain |
| Cruising in the Stellar Sea (five-star) | Increases Dr. Ratio’s crit rate by 8%, and increases his crit rate against enemies with HP at 50% or less by an extra 8%. When he defeats an enemy, his attack increases by 20% for two turns | Purchase from Herta’s Store in the Simulated Universe |
| Only Silence Remains (four-star) | Increases Dr. Ratio’s attack by 16%. If there are two or fewer enemies on the field, his crit rate increases by 12% | All banners |
| Darting Arrow (three-star) | When Dr. Ratio defeats an enemy, his attack increases by 24% for three turns | All banners |
What are the best relics for Dr. Ratio?
Ahead of his release, here are the relic sets we suggest for Dr. Ratio. As he releases, we’ll fine-tune our picks and advise with any changes.
| Relic set | Effect | How to obtain |
| Wastelander of Banditry Desert | Two equipped: Increases imaginary damage Four equipped: When attacking debuffed enemies, Dr. Ratio’s crit rate increases by 10%. If the enemy becomes imprisoned, his crit damage increases by 20% |
Cavern of Corrosion: Path of Conflagration on the Xianzhou Luofu |
| Musketeer of Wild Wheat | Two equipped: Increases attack Four equipped: Dr. Ratio’s speed increases by 6%, and his basic attack damage by 10% |
Cavern of Corrosion: Path of Drifting on Jarilo-VI |
| Ashblazing Grand Duke | Two equipped: Increases follow-up damage Four equipped: When Xueyi uses her follow-up attacks against an enemy, it increases her attack by 5% for every time the follow-up attack deals damage. This can stack up to eight times and lasts three turns. The effect disappears when a follow-up is next used |
Cavern of Corrosion: Path of Darkness on the Xianzhou Luofu |
Planar ornaments
| Relic set | Effect | How to obtain |
| Space Sealing Station | Two equipped: Increases Dr. Ratio’s attack by 12%. When his speed reaches 120 or higher, his attack increases by 12% | Immersion Reward devices in World 3 of the Simulated Universe |
| Firmament of Frontline Glamoth | Two equipped: Increases Dr. Ratio’s attack by 12%. When his speed is equal to or higher than 135 or 160, his damage increases by 12% or 18% | Immersion Reward devices in World 8 of the Simulated Universe |
What are Dr. Ratio’s abilities?
Dr. Ratio focuses on single-target damage and has a follow-up attack in his kit. He can dish out some hefty imaginary damage. Here are all his moves.
Active skills:
| Skill | Effect |
| Basic attack: Mind is Might | Dr. Ratio uses his codex to deal imaginary damage to a single target |
| Skill: Intellectual Midwifery | Unleashes a stronger imaginary attack on a single target |
| Ultimate: Syllogistic Paradox | Dr. Ratio summons a leaning tower and plots a trajectory to inflict maximum damage to a single enemy. The target enemy also gets inflicted with Wisemans Folly. When an ally attacks a target marked with this, he launches his follow-up attack (Cogito Ergo Sum) |
Talent:
| Skill | Effect |
| Cogito Ergo Sum | Dr. Ratio triggers a follow-up attack after using his skill. He pays attention to enemies’ debuffs during battle – the more debuffs the enemy has, the higher the chance of him launching a follow-up attack |
Technique:
| Skill | Effect |
| Mold of Idolatry | Dr. Ratio creates a dimension and taunts nearby enemies. When an attacking a taunted enemy to start a battle, there is a chance to reduce the target’s speed |
Who is Honkai Star Rail’s Dr. Ratio?
Described as ‘candid and self-centered’ Dr. Ratio seems like an interesting guy. He’s a member of the Intelligentsia Guild, which collects and trades knowledge across the universe. In the Guild, there are different schools, though Hoyoverse hasn’t revealed which Dr. Ratio belongs to just yet.
Boasting unparalleled intelligence, Dr. Ratio has one cause in mind – to rid the universe of a terrible disease: ignorance. Not gonna lie, he seems very full of himself, but hopefully, his kit will redeem his questionable personality.
Who are Honkai Star Rail Dr. Ratio’s voice actors?
Dr. Ratio’s English voice is Jordan Paul Haro, known for his work in other games like Ancestors Legacy and Minecraft. Meanwhile, his Japanese voice is Shunsuke Takeuchi, who provides voices in Street Fighter 6 and Vinland Saga, among other titles.
That’s all we know about Dr. Ratio so far, so why not brush up on some other builds? We’ve got guides for Honkai Star Rail’s Argenti, Honkai Star Rail’s Huohuo, and Honkai Star Rail’s Hanya to ensure you get the right relics and light cones on each character.
