Masayuki Doi (土居政之) is an employee of Atlus, working as a graphic artist since Persona 2: Eternal Punishment. Before Doi was chosen as the character designer for the Trauma series starting with Trauma Center: New Blood, Doi was primarily occupied with the coloring of character portraits and the creation of the visual design of the dungeons.
Kazuyuki Yamai, the director of Shin Megami Tensei IV, explained in an interview that he chose Doi as the character designer for the game since Doi is able to create simplistic characters that have a strong sense of presence.
