Seth (Dinosaur King)

Seth (ノーピス Nopis) is probably the most sinister character in the series, as well as the most manipulative. He betrays his comrades twice, turning against the Alpha Gang[1], then later turning on the Spectral Space Pirates[2]. He argues that modifying dinosaurs is for their greater good, and often sends Rod and Laura on missions to capture dinosaurs.

In the second series, he joins the Spectral Space Pirates after they saved him. There, he helps Spectre with the dinosaurs, and creates Gigas, Armatus and Maximus. However, he betrays them, and sacrifices himself to destroy the Black Pterosaur.