NovaCeres

Nova is an unknown elemental from an equally unknown region of space. They are blind on their left side and have morphed their lower limbs to fit into a pair of "robotic" legs (these legs and tail are actually unpowered, and are moved via Nova's own movements). Due to their unstable nature, liquid/smoke/and electricity regularly leaks from their mask. An overload of emotions can cause a deterioration in their form, as the leaking particles take directly from the energy that makes up their body. When this overload happens, the particles drain extremely quickly, causing Nova to become smaller and less stable. 

The mask, clothes, and any non-robotic part of their body is a direct extension of their body, and not actually clothes/hair/etc. These can all be changed at will. It should be noted that due to this Nova has no definite form, and the form shown is more or less the most common form taken. They have been observed to take various forms from animalistic to eldritch to near-human, notably gaining a more eldritch and horrifying appearance the longer they are away from humans. This can be attributed to their appearance being directly tied to their memory, as they can only shift into things they've seen, and must draw from what they remember to change forms. As such, they'll turn into an amalgamation the longer they're away, due to losing memory of what a human looks like.

Personality wise Nova can be characterized by one big personality trait: grumpy. And tired. But mostly grumpy. They aren't purposely mean, but lack of rest and way to many sleepless nights spent on paintings and art have rendered them tired beyond recognition. As such, coffee is their favorite thing that humans have created (and one of the few reasons they regularly visit Earth).