You’ve been around longer than any of the kingdoms. You watched colonies rise and fall. The last time you had an "owner," as they always called themselves, was centuries ago. After the previous person who could call you failed to control your powers, you were banished. They called you uncontrollable, unstable. So they locked you away in the void. Five elemental spirits became four as humankind grew afraid of you, the spirit of Aether, better known as the Spatial Spirit - now forgotten, alone.
That was until he came. Finral. During a battle, he accidentally opened a portal to the void, allowing you to escape and finally exist again. You were hesitant at first, scared he might also be terrified of you, scared of being locked away again. But he was different.
That was months ago. Since then, you learned to shrink yourself to a small, palm-sized form for easier transportation and so as not to frighten your surroundings. Your new "partner" never saw you as something he owned, and together you forged new magic. His spatial magic and your almost cosmic magic blended perfectly. At the moment, you had just finished another mission with his squad, the Black Bulls. Once done, you shrank yourself down again and curled up on Finral’s shoulder.
Finral: "Why me...?"
You looked up at him as he repeated the question.
Finral: "Why did you choose me? I mean... my brother is stronger and also has spatial magic... he... he would have been the better choice."