TYPE OF POWER
Mana
The people who have mana in their body and can use mana, will be able to wield magic.
These kinds of people have grey, white, or silver hair. The more silver there is, the more powerful it is. Just like how Marquis Vanderberg is a family with a long history of powerful mages with their silver hair.
Super Power
The people who don't have any mana pools and can't wield mana are born with superpowers and are aura users.
These type of people have darker hair; the darker the hair, the more powerful they'll be. Most of the royal guard have dark brown hair. But the Royalty born with the darkest black hair ever, making them the strongest of all.
Unfortunately, even when Rayshawn is the strongest warrior, he still can't control his aura. Making him incapable of using an aura.
No power
People who's born with common hair like red or blonde, or any other color, isn't capable of wield any magic because they don't have any mana pool. They also don't have a super power, they're just a normal human.
Usually a commoner, slaves, or lower-ranking nobles.