So i was looking at different potential backgrounds for an aasimar I thought up, but now I have a question. Can they only be from the good aligned planes, or can they be from any plane where a deity that isn't obviously evil resides? Example could the aasimar be from Limbo where Tempus and Red Knight reside?

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Lance battle shifter of Red Knight
Lyle Underburrow...I would watch where you step when he's around, you might go boom

Sourcebooks consistently and specifically define aasimar as the descendants of a union between a human and a good-aligned outsider. Amia has expanded that to include the offspring of a union between any PC race (not exclusively human) and a good-aligned outsider, but the alignment requirement is constant. I think the descendants of a neutral outsider wouldn't have paladin as their favored class.

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Winner of Amia's "Most Ethical Time Traveler" award 2026

Character Portraits!

Red Knight's domain, along with Tempus, and Garagos, is The Warrior's Rest, which is a TN demiplane that likely occupies a space in the Beastlands or Ysgard in our cosmology since we mix Great Tree and Great Wheel.

not Limbo.

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Davion Telemos - Monk of the Four Winds
Korthan Isharnos - Dragon Shaman of Thunder Spirit Zamasham

What they said. It is not impossible that Ysgard/The Beastlands would have good-aligned outsiders serving those neutral deities, though. You could look up the list of creatures in service to Tempus from Faiths & Avatars.

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It can be any good-aligned outsider, does not not need to be from a good aligned plane

There are several native outsiders which work as well