He is voiced by Yuichiro Umehara in the original Japanese version and by Bryce Papenbrook in the English dub.
Eugene Sevenstark was the original leader of the Chryse Guard Security Third Group until Orga Itsuka joined and got promoted past him. After the Third Group staged a revolt against the adults of the company and took it over, renaming it Tekkadan, Eugene became Deputy Leader of Tekkadan to Orga.
After the outcome of the McGillis Fareed Incident saw the destruction of both the Revolutionary Fleet and Tekkadan, Eugene and numerous other members of Tekkadan were able to avoid being killed by the Arianrhod Fleet thanks to Mikazuki Augus and Akihiro Altland holding off the Gjallarhorn forces while they escaped. After the war ended, Eugene, now living under a new identity, became the head bodyguard and assistant to Kudelia Aina Bernstein after she was elected president of the Mars Union.