Everyone in the universe is born with two tattoos, one on each of their forearms, just beneath the crook of their elbows. But these tattoos are not just body art, they are symbols, each one meaning something different, each having a matching tattoo on someone else in the universe, one tattoo matches the one who is your soul mate whilst the other matches your worst enemy.
Most would think this a gift from the gods, you knew who your soul mate would be, you could find them and live happily ever after but destiny played a cruel trick, there is no way to tell which tattoo matched your soul mate and which lead to you mortal enemy.
Apart for one person, Kara Danvers, a young alien from a destroyed planet, she knew exactly which tattoo belonged to her soul mate and which did not, not because she had met the one she was destined to be with, but because both of her tattoos were identical.
To her knowledge she was the only one to have two of the same tattoos, one on each of her forearms, this only meant one thing and it terrified her, whoever her worst enemy was, they were also her soul mate.
Kara had always felt a little out of place on earth, she had been sent here as her planet got destroyed, she had been taken in by a loving family, who she wouldn't trade for anything, but she had been hiding the fact she was an alien since she was a child, also she had learned very early on that everyone else had different tattoos on their arms, whereas she had matching fleur de lis, she had been teased about it by the other students, that she was destined to kill her soul mate, or that she was her own soul mate and therefore destined to be alone.
During her high school years she had taken to wearing long sleeves and even a couple of time taken a sharpie and altered her tattoo a little on one side in the hopes that the ridiculing would cease, but everyone in that small town knew that she was the girl with the matching tattoos.
Growing up had been hard on Kara, it's one thing to be called an outsider but to know deep down that you were, it made the comments cut a little deeper and made Kara a little sadder, she was glad that she had a sister like Alex.
Alex was always there for her, standing up for her, Kara's adoptive mother and father had told Kara that she was more powerful than everyone else and that she had to be careful with them, so many time Kara wished she could just show them and then none of them would make fun of her, but she also understood the risks of showing her true self to them, so she took the abuse and stayed quiet, school wouldn't last forever, then she could hide the fact that she was different, start anew.
And that is exactly what she did, she and her sister Alex moved from Midvale to the bustling streets of National City, where Kara had gotten a job at Catco magazine as the great Kat Grant's personal assistant, basically she was a coffee runner, but what a lot of people didn't know was that when she wasn't getting coffee for one of the most powerful women in National City she was flying around in a red and blue suit saving the day as Supergirl.
Only a handful of people knew her true identity, those she held closest to her heart, they helped her to protect the city from whatever threats that may darken their streets, she was loved by the people as Supergirl and was liked by Kara Danvers even though she kept mostly quiet, it was better that way, less people looking at Kara Danvers meant that there was less chance of people making the connection between the two.