Just use someone or play as your OC...
For instance... I play as Eclipse... Shadow's brother... but I have a backstory: I was born on a planet alled "Ragnorok" in a different universe. Then the jackals came and destroyed my planet with help from a fox I call "Time-Rift Tails" and he liked every moment of it. He has destroyed many OTHER universes with me in it as he says, but he says Solar Eclipse killed his parents in the future. Lunar Eclipse was the other part of me. Solar and Lunar were both born from the same test tube but nearly apart. We were fuaed for 6899 years. And 107 years later, we finally broke the bond. Time-Rift Tails had planted things in the test tubes to make two of me. Solar was meant to make the Bad cop and Lunar was good cop. Little did he know that sabotaging Black Doom's plan to conquer the universe was gonna help Solar kill his parents. Black Charisma was our sister. We had escaped destruction of the world as well as 1489 Darklings other than us had followed. We had come here through a portal. Time-rift Tails followed, escaping the destruction as well. Little did we know about it though. And the chemicals that Tails planted? They gave us our powers:
Solar: fire powers, super strength, and the ability to remove Darkling blood from new comers safely
Lunar: invisibility, the ability to manipulate portals, and the ability to remove Darkling blood from new comers safely
At some point into the story, I had one of my Darklings build a shrink ray. He was very smart and half robot. When I broke it, a corrupted beam hit me and I shrank. Now, I'm forever stuck half the size of a Chaos Emerald... For a long time when Solar got mad, he took full control over Eclipse and turned his eyes red.
Lunar didn't want that... So 1000 years later, Eclipse found a way to put Solar asleep for 6944 years, the amount of time that Charisma was outcasted for after Black Doom decided I was his favorite. Black Charisma was so mad that Black Doom ordered us to make a blast so powerfull that we rip her from reality. For the longest time, she was able to take control of us. But her powers weren't able to be used. She couldn't dampen others' powers while inside of Eclipse's head
Our powers were swapped at birth but we decided to keep the new change. Then we decided on names: Solar for fire, and Lunar for lurking (could be anywhere with that invisibility and the portals)
I kept it a secret from EVEN Black Doom for 7
6000+ years. Later down the road, after I knocked out Solar, I watched Shadow kill multiple Darklings but he didn't even know about the six-armed one. For a time, Black Doom had been giving orders for me to carry out to the other Darklings. But that all changed when I met Sonic's coffee... Mmmmmm- HEY WAIT A MINUTE I'm getting off topic!!! Anyway... So when Shadow had put Black Doom in the body of a Chao, Cheese, I didn't come to my senses to think he would ever escape and had still been commanding the Black Arms for him... But I decided recently that I should start a new army because Black Doom only cared about himself and our kind was getting scarce. So when i switched, Solar woke up and thought I was crazy. Charisma, who had been upset for the longest time, had finally found Sky Sanctuary Zone, where I had built my base, and decided that she was going to get payback for not being loved. I tried to convince her but she wouldn't listen... Causing every Darkling that didn't listen to her to fall. She had the ability to turn herself into oil. She could stand thousands of volts of electricity being forced upon her. So I could do nothing... And when she touches someone, that person melts as she melts and reforms as she reforms. But she was in the form of an energy ball and was possessing me as a host. She had learned to somewhat trust me and had come back into reality using a machine that someone had built and the first thing she felt when she came back was love. She didn't like me but she had to care because I was her brother... Or rather, her brothers... If you recall from an earlier point in the story... And at that point I had my invisibility back. I was hiding from her on the floating island in Sky Sanctuary Zone in my 3 mile × 3 mile long base. Other Darklings were afraid as well... And they still are... But now, she trusts me... Or us... fully and has joined the reign against evil. We were like before again... Siblings.