some of the villains have sad pasts that made them choose the path of evil ..... Shadow Moon was no different ..... she talk different , her hair look different, her eyes look different, she mostly likes to walk like a human, she got the marks on her legs, and she look too cute for own age ...... for being different, she got bullied ..... till she finally snapped and became evil .... thats how she got her "cutie" mark; an empty heart with a demon tail
being alone and evil is better than being with people (or ponies) and get hurt over and over
you know, some say that your OC is represent your inner-self ..... I wonder how right it is
I know that pains of being bullied and attacked both mentally and physically. I can deeply relate to this. It only takes that one extra push, punch or insult to send the bully over the edge and become the very thing that they feared.