Omniscient

[Mark Zuckerberg]

One having total [knowledge]
No [mortal] being is omniscient, though this could be used to state that some person knows almost everything about [a thing].

[Zipporah Schumaker]

Knowing everything.

[Cami]

The name of the [Administrator] on the largest [MyBB] forum otherwise known as [Hackforums].

[Julene]

having or seeming to have unlimited knowledge: