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Aquaman doesn't look human, and he; his species and such are all aliens. Living for 4,000 years underwater on earth.
>Martians live among humans, both kinds - separated colony from "Martiasola" - what they call their home and confused us to call it Mars. Teaching us over the years to become a space faring race - Martians living in Shangri-La
[/spoiler:lit]Factions of the Reach before they went 'evil' pass down a scarab generation to generation for 4,000 years (same as the other two who agreed to be nice on earth). These "aliens" live underground to explain Terra from Power Girl Comic's background.[/spoiler:lit]
A small group of robots on an ancient ship at the north pole being a age old scout ship from Krypton, the furthest planet who arrived first. An original earthling colony from krypton genetically altered to take the sun rays without being mutated. A defect later cured on Krypton but other Kryptonians (earthlings/Humans) will never have. This is why Superman has a kid with Lois.
An alien 4 way with earth, all so old you can't call them aliens. Especially when humans are also alien to earth. (Martians call it Solar 3 and so does the ancient colony ship)
This would be really fun to write. Could be over some sort of secret radiation at the center of the planet that causes "magic" or something else. Like protection from Trygons influence or even worse, a gateway that all four swore to protect from such evils.