流 竜馬
from New Getter Robo
yoma is the original leader of the Getter Team and the protagonist of many of the Getter Robo adaptions. In the original manga, he is portrayed as an extremely violent martial artist and the son of the "Dojo Destroyer" Ichigan Nagare. Ryoma is first discovered by Professor Saotome's assistants when he breaks into a karate tournament to take revenge on them for disgracing his father's name. Impressed, Saotome follows this up by sending 3 hitmen after him as a test of his ability. Ryoma kills all three men, and in his weakened state is kidnapped by Saotome and taken to his research center. There he meets Saotome and his daughter and son, Michiru and Tatsuhito. Soon after, the research institute is attacked by dinosaurs and many of the staff, including Tatsuhito are killed. Saotome tells Ryoma to pilot the incomplete Getter Robo in place of Tatsuhito against the attacking dinosaur empire. Ryoma succeeds at this, and continues to serve on the Getter Team as it's leader.

New Getter Robo
Humanity is under attack by demonic creatures called Oni. Unable to fight back by any other means, the scientist Dr. Saotome creates a series of giant robots that harness the mysterious power of Getter Rays, giving them the strength necessary to fight the Oni. The strongest of these is Getter Robo, and Saotome must enlist three very different men to pilot it - martial artist Ryoma Nagare, criminal leader Hayato Jin, and monk Benkei Musashibou. Together, the Getter Team fights to end the Oni menace forever. Source: ANN