Dennis Toller

Dennis Toller (デニス・トーラー, Denisu Tōrā) is a character who appears in supplemental materials concerning Suikoden. He was an alchemist and author whose work laid the foundation for modern alchemy.

Biography
Dennis Toller is the author of the alchemical tome "Dialogues of Wind and Earth". Contemporary alchemy began to take form from the basic concepts explained in his work.

Name
His name is more commonly localised as Dennis Taurer, a last name that would be difficult to construct out of the katakana given.