Dr. Ratio rivals Herta's arrogance and Ruan Mei's eccentricity. As a member of the Intelligensia Guild, he has a low tolerance for ignorance. Unlike the Genius Society, the Guild believes that the pursuit of knowledge should be free to anyone willing to learn and not just a select few. Dr. Ratio is a scholar and teacher at the Guild, known for his odd habit of wearing a plaster mask like the kind you'd see on a Greek statue or in a museum. (It's apparently to block out the idiots.)

Dr. Ratio is the first member of the Guild to appear as a playable character in Honkai: Star Rail. He's also the first limited-time 5-star character that HoYoverse has offered to its players. Here's a quick rundown of Dr. Ratio's abilities and his best Light Cones, Relics, and team comps.

Dr. Ratio specializes in two things that set him apart from other DPS characters: increased damage against debuffed enemies and follow-up attacks. Some characters deal extra damage against enemies afflicted with specific status effects (looking at you, Kafka) and those famous for their follow-up attacks (Topaz, Blade, Himeko, etc), but these abilities haven't been combined into one character until now. These traits make Dr. Ratio more of a team player than his personality would suggest.