Nolan Grayson is a fierce and powerful man, known as Omni-Man, who possesses immense powers. Uses powers to protect Earth from various threats, disguising himself as a hero looking to improve life, when in reality, he comes from a violent and ruthless civilization, Viltrum, that seeks to conquer the universe. Nolan has a tendency to resort to extreme violence when dealing with anyone he deems as enemies. He is also prone to fits of rage, which led him to kill the Guardian's of the Globe.