A standard Celeian has one starlight color, one nebula color, solid white lightmatter parts, and stars in their nebula body that range from their starlight color to white. Unless you have the Inversion ⟐ trait, starlight and lightmatter colors must be bright and nebula colors must be dark. 

Celeians have nebulous bodies that appear to hold stars within them. The nebula body is amorphous and often wispy, while their lightmatter parts are solid light. 

If they have a "face," then it can be a mask-like construct of their lightmatter with no mouth or nostrils (but can have a nose shape). Their "eyes" would be gaps in the "mask" and cannot have any iris or pupil, though they can be expressive (squint, blink, etc.). They can alternatively have an abstract pattern of lightmatter shapes where their face would be, or no distinct face at all.  

They can have any anatomy/shape, including humanoid, feral, abstract, etc., and can shapeshift freely (but prefer a particular form). Their appearance, if mimicking the anatomy of an organic creature, does not need to align with proper organic anatomy. Their limbs, if any, may be composed of their nebula body or from lightmatter parts; lightmatter parts often have more abstracted, disconnected forms. However, the nebula body should all be connected.

Lightmatter parts can be floating and disconnected from the body, and can include halos, wings, and more. Most Celeians, though not all, have a sigil of lightmatter on their chest where their core is underneath. 

The only constant part of them is their "core," which is usually hidden within the nebula portion of their body. It is the color of their lightmatter, radiating colors from their starlight color to their lightmatter color. If exposed, it can shine very brightly; they can temporarily expose the core which will lead to them radiating a large amount of celestial energy, but permanently doing so requires the Luminary ⟐ trait. 

◆ Phasic

"Uncommon" traits.

◆ Dual Light: Two starlight colors.

◆ Dual Nebula: Two nebula colors.

◆ Phase Shift: Lightmatter parts are one of the starlight colors instead of white.

⬖ Eccentric 

"Rare" traits.

⬖ Aurora: 3-5 starlight colors.

⬖ Abyss: 3-5 nebula colors.

⬖ Multiphasic: Lightmatter parts can be multiple colors of the starlight colors.

⬖ Devoid: No distinct sigil. 

◇ Anomalous

"Very rare" traits.

◇ Nova: Unlimited starlight colors and/or starlight colorshift. Colors not included in the ML image can be depicted when drawing them.

◇ Singularity: Unlimited nebula colors and/or nebula colorshift. Colors not included in the ML image can be depicted when drawing them.

◇ Inversion: Starlight colors and stars are dark, nebula colors are light, and lightmatter parts are black.

⟐ Aberrant

"Special" traits. These have lore requirements. 

⟐ Luminary: Exposed core by default, accompanied by high levels of energy and magic. Note that cores can temporarily be exposed freely. (Requires backstory; see lore)

⟐ Shattered: Lightmatter parts are broken into cracked and shattered pieces, and/or nebula body appears to have cracks with starlight shining through. (Requires backstory; see lore)