— 𝗢𝗹𝗶𝘃𝗲𝗿 𝗚𝗿𝗮𝘆𝘀𝗼𝗻. . .

Oliver Grayson, Mark's younger half-brother, is a Viltrumite-Traxan hybrid. His most striking physical feature is his purple or lavender skin, inherited from his alien mother. He has a lean, muscular build, with unruly hair and features that resemble those of a human.

As a child, Oliver embodies the true nature of an innocent youngster: curious, lively, and affectionate. In his pre-teen years, he retains his liveliness but has become a stubborn and impulsive boy who doesn't fully grasp the consequences of his actions. While naturally friendly and outgoing, in his quest to become a superhero, he has adopted a more logical than ethical perspective, failing to recognize the horror of killing criminals and seeing it as a way to improve the world. This mindset stems from the human tendency to commit acts of violence and destruction so frequently. Because of this, he has also come to regard people without superpowers as inferior to beings like himself and his brother.

Although Oliver has a pessimistic outlook on life, he cares deeply for his loved ones and enjoys making friends whenever possible. He feels a special affection for his family, especially his brother. He even admires his father so much that he created his superhero costume and name after him. Furthermore, he values ​​other people's perspectives and avoids using lethal force whenever possible, as it upsets his mother and brother.