Ryoma Nagare debuted as a martial artist driven to avenge his father's dishonor, crashing a national karate tournament to defeat participants and prove his father's fighting style superior. This demonstration captured Professor Saotome's attention, leading to Ryoma's recruitment after he survived an assassination test against three skilled attackers. An alternate incarnation depicted Ryoma as a high school student involved in soccer, possessing a less aggressive personality, with his kendo-practicing father still alive. Known for intense aggression and emotional volatility, Ryoma often displayed a Blood Knight mentality, enthusiastically embracing combat. Despite righteous intentions to protect humanity, he exhibited Ax-Crazy tendencies, employing extreme violence against threats without hesitation or mercy, even towards enemies possessing human hosts. His personality evolved across appearances; in Getter Robo Armageddon, framed for Dr. Saotome's murder and imprisoned, he exhibited Pragmatic Hero traits. Initially consumed by revenge against Saotome and former ally Hayato Jin upon release, he gradually refocused on eliminating the alien parasite Invaders threatening Earth. Ryoma possessed exceptional combat abilities unaided by mechanics. Trained in his father's pragmatic karate style, he achieved Charles Atlas Superpower feats: breaking a katana with his chest muscles, punching dinosaurs to death, and defeating armed opponents while severely injured. He survived high-impact falls and resisted potent tranquilizers. As a pilot, he operated various Getter machines with high proficiency, including modifying the wrecked Getter Robo into Black Getter, and demonstrated strategic aptitude by identifying enemy weaknesses mid-combat. Ryoma piloted Getter-1 across multiple timelines. In the original manga, he battled the Dinosaur Empire and later the Hundred Demons Empire, experiencing a Disney Death when captured and brainwashed before rejoining his team. Shin Getter Robo featured visions of a catastrophic future linked to Getter Rays causing him to abandon piloting for 16 years, though he returned in Getter Robo Go's climax to operate Shin Getter Robo when humanity faced extinction. The Armageddon timeline saw him imprisoned for Saotome's murder, later released to combat the resurrected Saotome and the Invaders. After failing to prevent a nuclear strike on Shin Dragon, he vanished for 13 years before reappearing on the moon piloting Black Getter. He ultimately sacrificed himself alongside Hayato and Benkei to close a spacetime rift, remaining in a future timeline to continue fighting. Key relationships defined his character. His bond with Hayato Jin shifted from close allies to bitter enemies after the Saotome incident in Armageddon, though they eventually reconciled. Musashi Tomoe served as a contrasting figure whose physical strength complemented Ryoma's spirit-oriented role. Professor Saotome acted as mentor and mission provider, with Ryoma consistently referring to him derogatorily as "jiji" (old man), reflecting their strained dynamic. Ryoma fathered Takuma Nagare but departed before learning of his existence; his legacy persisted through Takuma in Getter Robo Arc. Symbolically, Ryoma embodied the "Spirit" component within the Getter Team's Body-Mind-Spirit dynamic. His indomitable will and hotblooded recklessness often drove the team through impossible situations, utilizing Getter-1's will-based attacks like the Getter Beam and Shine Spark, which drew power from pilot solidarity. His character arc explored the paradox of resisting destiny while accepting its inevitability, particularly regarding Getter Rays' role in universal evolution.