|Age||early to late 40s|
|Relatives|| Haruka Ouma (Younger Sister)|
|Occupation||Head of the GHQ Antibodies|
|Anime debut||Episode 1|
|Japanese voice||Kazuhiko Inoue|
|German voice||Wolff von Lindenau|
He is a middle aged man, with greying hair, and a medium sized mustache. He usually wore a lab coat, when in GHQ.
As a graduate student, Shuichiro's brilliance isolated him from the rest of his peers whom he ultimately came to see as mere annoyances that obstructed his intellectual growth. Upon meeting Kurosu Ouma, he finally met a person whom he could call his equal and the two quickly became friends. However, over the years, Keido grew increasingly embittered towards Kurosu as he witnessed his colleague's success and intellect steadily eclipse his own. Upon learning that Kurosu's offspring would become the progenitors of a new race in the aftermath of the Fourth Apocalypse, he experimented on countless orphan boys (including Gai) to create an "Adam" that would deny Kurosu the privilege of shaping the next generation of humanity in his own image. After learning that Kurosu's research on the Apocalypse virus surpasses his own, he murders his friend in a jealous rage. From that moment forward, Keido dedicates his entire being to ending the world that Kurosu worked so desperately to save.
A very stoic individual, usually keeping a calm and collected face. During the flashbacks in episode 20, the first thing that stands out about him, is his friendship towards Kurosu. At first he was very happy, to have made friends with Kurosu but his feelings eventually turned to jealousy when Yu revealed that his friend's DNA would be the basis of the next generation of humans and for Kurosu having solved the mysteries behind the Apocalypse Virus. This multiplied his jealousy and forced a drastic change in both himself and his relationship with Kurosu. Overtaken by his rage, he murders Kurosu in cold blood, accusing Kurosu of being jealous of his position.
Once Kurosu had been eliminated, Shuichiro saw fit to bring about the Fourth Apocalypse using his own DNA to usher in a new era for mankind.