As a young changeling, he was always fascinated by the skills of well trained unicorns, but being a changeling, they are not known for their magic beyond changing forms, so he snuck away from his hive one night and made himself a disguised pony form so he could grow up among other ponies and learn at school with actual unicorns. His trick paid off, and he was able to grow up as a pony, practicing magic skills through the years. As an adult, he’s adapted his pony form and his skills to specialize in star fields, mapping out the stars via his honed in magical ability.
So these OCs aren’t anything special, just thrown together ideas that don’t mean much. If, for some reason, anyone likes these OC designs and wants to use them, sure, you can, just let me know, but be warned I’m still gonna use them for stuff.