White-Haired Pretty Boy: Subverted. He may be Rhodanīs cynic rival, but he is one of the good guys.
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.
Break the Cutie Recently forced to walk for several million years through a white corridor of nothing, which made him start to behave like The Stoic, and effectively turned him into a Time Abyss.
Immune to Bullets (literally): Haluters can transform their whole body into a nearly indestructible form of matter on a cellular level, although they cannot move in that condition.
Genius Bruiser : is well regarded as a scientist and capable of calculating faster than most computers (wich is a racial trait for his species)
Gentle Giant: has motherly feelings for "his" terrans.
Roi Danton (really Michael Reginald Rhodan), born 2405 A.D. as son of Rhodan and his second wife
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
Dreaming of Things to Come / With Great Power Comes Great Insanity: Bostich's logic sector, when first activated, exhibited multiple personality disorder and spoke to him only in visions and dreams until Bostich finally managed to exorcise himself in a dream by killing all his "advisors" who had prophesied he would be emperor one day. Only afterwards was he able to hear the voice of his normal Extrasinn. Years later, when he received his own immortality device, Bostich got confirmation that the same cosmic entity who had granted Rhodan immortality had been manipulating Bostich's dreams (and maybe his life) all those years ago.
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.
Monkey (actual name!), a human from a high-gravity world, a former Terran secret agent and trained assassin, leader of the New United Stars Organisation.
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.
Others
Mirona Thetin, born ca 25,000 B.C. on Tamanium, was a lemurian scientist and Factor I of the Masters of the Island.