All three have a unique aura that suggests they are one of a kind. In fact, every Sovereign is a unique existence in the cosmos; even if somebody manages to take control of a Sovereign's body, it wouldn't have the same aura as the original Sovereign.
So, it's kind of impossible to fake their identity as a sovereign, at least it is said to be.
The first one had a silver, crystal-like body; clearly, he wasn't human but from some different race. His aura, just like him, had a bit of mysteriousness to it. His aura was a bit like a mirage that seemed to make everyone lose their way.
The second Sovereign was also not a human but a wolf, or, to be exact, a massive thirty-foot-tall werewolf. His aura was wild and ferocious, filled with blood and slaughter.
And the third and last Sovereign seemed human, with a handsome young face, but Apollo felt something different about him, which he couldn't describe. His aura was calmer than the rest, but it seemed to have a unique aura of heaven.
