Body

..... Astrums' bodies are made of stardust. They are all genderless because they don't reproduce, but there is still slight "sexual dimorphism". They have no need for eating, sleeping (although they can rest if they are bored), or breathing... they are also extreme temperature/force proof (they live in the vacuum of outer-space after all!). They don't sweat or have much in the ways of bodily functions... in other words, they are extremely hardy and low-maintenance.

Heart

..... The 'heart' is the only internal organ Astrums have. It's right in the center of their chests, and pumps blood filled with "star power" through their bodies. Heartbeats are completely individual, ranging from a beat so fast you can't see it (this makes their hair look likes its constantly glowing) to a beat so slow you'll only see it once every 5 years.

Their heart is one of the only things they cannot regenerate.

Horns & Tails

..... Most Astrums have horns or antlers of some kind; they can look like just about anything. They are gradient and have yellow or white stars on them. It is possible for them to not have horns at all, but that's a rare thing - as are Astrums with more than one set of horns.

..... Tails are a recessive trait that few Astrums display. They are long and white, and Astrums can use them as stabilizers in space.

Blood

..... Astrums blood is starry and dark, and looks a lot like outer space... but it's also highly poisonous and can kill things on contact lol. Their nails and sclera of their eyes are black as a result of their blackish-purple blood.

Bio-luminescence

..... Astrums hardly ever land on planets (entering and leaving atmospheres is annoying and potentially hazardous), but when they do they have a daytime/nighttime form. Some parts of their bodies glow in the dark!

Starlight & Shape-shifting

..... Astrums can generate "starlight" energy fields. They use these beams of light for attacking and defending when they have to, but they mostly use them for inter-space travel. When they get up to their top speed they can travel at the speed of light, looking very similar to a shooting star!

..... Because of their ability to bend light Astrums can potentially create illusions - including bending the light around their bodies to change their appearance. (They tend to wear things on their heads when they are imitating humans because hiding that pulse of theirs is annoying and harder to keep up for regular Astrums!)

Psychic Powers

..... Since there's no sound in space, Astrums speak to each other through psychic connection. They can feel each others' life force from billions of light years away. Although the speak "the language of the stars" between themselves, They are highly intelligent and can learn virtually any language very quickly.

Regeneration

..... Astrums can regenerate almost every part of their body, as long as their heart (and/or star) are unharmed. It's pretty rare that they actually have to though, because they are very hardy.

Childhood

..... All children are born with white hair. (They are considered "Proto-stars"). They have distinctive wings that eventually merge back into their bodies as they become adults. 

..... Adolescents hair gradually changes from white to color (sometimes).

..... There is no way of predicting what they'll look like when they are adults. As more stars are born, the older ones are pushed out into space, so they age completely under their mother and older sibling's care. Eventually they are pushed out into space and leave home as young adults, where they'll be pretty solitary for the rest of their lives.

Stellar Companions