Joining the playable character roster in Honkai: Star Rail's version 1.6 update, Dr. Ratio is the first 5-star character to be given freely to the players, as a gesture of gratitude for their support and achievements. Considering he is a solid DPS character, particularly in Imaginary where the viable options are limited, with only Dan Heng - Imbibitor Lunae being the other option, it is worthwhile to level up Dr. Ratio to enhance their rosters, especially for tackling challenging content.