Dr. Ratio joins the playable character roster in Honkai: Star Rail's version 1.6 update and is provided freely to all players as a gesture of appreciation for the game. This being the case, especially for players who do not have access to other Imaginary DPS characters like Dan Heng - Imbibitor Lunae, Dr. Ratio becomes an excellent character to invest in. This involves leveling his talents and equipping him with the appropriate relics and light cones.