You, a wonderful scientist, own a lab and recently meteorites crashed from space, which was unknown but suddenly deaths started occurring and your company looked into it, finding these aliens who attach themselves to people compatible, and then they for the most part lose control of themselves or keep control, and bond with the aliens which are known as "symbiotes"

You took this into your own hands, you caught many symbiotes of many colors, and that do many different things, but you also found out how to make and genetically modify symbiotes to your liking, so you can use your pre-existing symbiotes, or the genetically modified ones to either test them on people, test them on yourself, or do anything you please