Rintaro Okabe

Rintaro Okabe was a Japanese scientist who created the Shepard Serum using knowledge obtained through his time travels and was forced to use a preliminary version to transform Heldalf into the Lord of Calamity. Fleeing to Hyland after his loss of his Time Machine, Okabe joined the Kingdom of Hyland where he managed to perfect his serum using Lailah's blood, using it on Shepard Sorey shortly before being assassinated by the CCG.