I like the idea of Humanoid having individuals that "pass" as Human. Including Elves.This is why I like both as an option. Some aasimar could pass as a human, with their story being based around uncovering and accepting this hidden link in their ancestry.
While some aasimar could look more like eldritch horrors (be not afraid), being some sentient construct created from the energies of the upper planes to do good in the world.
I use the same logic for genasi. They range from 'regular human with powers' all the way to 'sapient elementals'.
given the list of things people are willing to demonize includes their own offspring things being sort of demonic is pointless and I prefer not all foes be to interrelated makes the rogue gallery feel universe.I know.
Even in the Lovecraft novels, the aberrations are defacto demons. The twist is the scientific wordview observing it, and the dissolution of that rational science. Relatedly there is a Lovecraftian movie where a scientist observes a demonic possession, and scientifically traps the demon by getting it to possess an inanimate object, a chair.
Meanwhile, the assault against reality itself has a True Evil vibe.
The "Far Realms" can be deeper levels of the "Gray Waste". The whole alignment plane, the "Wastes".
Meanwhile, the creatures of the Yugoloth creature type look interchangeable with the creatures of the Aberration creature type.
Yugoloths are eminently boring, yet Aberrations are popular. Making the Aberrations the True Neutral Fiend seems useful for marketing.
I've seen the 5e cosmology map. It's a diagram representing a conceptual framework, not a literal physical map you can use to navigate walking from one plane to another.
These supposed "crossings" from the Upper Planes to the Feywild and the Lower Planes to the Shadowfell pass through the Elemental Chaos, which completely surrounds the Inner Planes and separates them from the Outer Planes (according to this diagram), so should we just replace tieflings and aasimar with genasi now too? By your argument, they should all be descended from elementals too...
More to the point, those "crossings" are the "borders" between the various elemental planes, which the chart of the Inner Planes in the DMG shows to be very much filled in with what I would describe as the para-elemental planes, where two of the big four elemental planes overlap with one another. That "crossing" linking the Upper Planes to the Feywild is the Frostfell (Para-Elemental Plane of Ice).
Also, if the Feywild and Shadowfell are connected to anything, it's the Positive and Negative Planes, respectively, which are shown on another diagram as domes encasing the Great Wheel from above and below. Not the Outer Planes.
Just because two things are drawn next to one another on a "map" doesn't mean it's actually possible to travel from one to the other - the map is not the territory. This chart was designed to show new players the major planes that exist and their overall groupings (i.e. Outer Planes, Inner Planes, and Material/Echo trio). I would hardly call its arrangement definitive.
Historically, the Inner Planes have been contained within the Ethereal and the Outer Planes within the Astral, with the Material Plane being where the two meet - a giant, cosmological Venn diagram. I do not consider that to have changed.
It's round, shiny, and near the head.what does a halo that is part of them look like then?
It's round, shiny, and near the head.
No need to be more specific than a tiefling having horns - there's no rules about what the horns look like and in actual play they're optional anyways.
They need something, I think, for the same reason tieflings need horns: so they read as angel-people and not just human. That's always been one of the issues with Aasimar.I doubt all of them will have Halos.