Homer G. Adams, born 1918 A.D., is a financial genius who joined Rhodan early. His holding "General Cosmic Company" provided money and economic influence for Rhodan, in exchange for Arkonide technology. A hunchback.
Last of His Kind: his species survived the destruction of their homeworld (thanks to him) but their descendants developed shorter lifetimes and eventually went extinct about 2000 years later. And he was estranged from them for most of the time.
Obfuscating Fobbishness: Not wanting to stand in his father's shadow all his life, the young Michael Rhodan went underground and invented the fobbish persona of the rake "Roi Danton" for himself, completely with historical costumes of an 18th century French aristocrat, and finds himself allies in a bunch of space traders.
Alaska Saedelaere, born 3400 A.D., victim of a transporter accident that fused him with something else
Shoot the Dog turned him into the Big Bad: During his darkest time, Bostich crossed the Moral Event Horizon when he had a former friend (who had started a rival empire) tortured and executed as a traitor and all of the 20,000 enemy spaceships mercilessly destroyed after they had been shut down by a computer virus and were helplessly drifting in space - with the crews still in them. Shortly afterwards, he had the Terran minister of defense, Reginald Bull, abducted and tortured for information.
Heartbroken Badass: Bostich considers himself a pragmatist, but he has the hidden heart of a romantic. Unfortunately, as a young man he fell in love with Atlan's daughter Jasmyne da Ariga although they only spent a few days together as a couple, and decades later he is still yearning for her, despite the fact that she has rejected him and threatened to slit his throat if he continues on his dark path.
Mind Rape: Which happened to Bostich when an evil newly ascended cosmic power named SEELENQUELL took over his mind and the minds of everyone on Arkon and forced Arkon into a direct war with Terra.
IT, the main higher entity of the series. IT rules the local group of galaxies and gave Rhodan and the others their immortality. Unlike other beings of its level, IT usually doesn't command the peoples in these galaxies (but tends to secretly nudge them in the "correct" direction).ESTARTU shares a common origin with IT and refers to IT as her brother.
Mirona Thetin, born ca 25,000 B.C. on Tamanium, was a lemurian scientist and Factor I of the Masters of the Island.