Contact-A-8

In 2156, a war broke out between countries on different continents. Ultimately, a biological weapon, the A-8 parasite, was used, altering its host beyond recognition, causing them to lose their minds. As a result, the remnants of humanity hid wherever they could, on islands, in bunkers. But the worst thing is that there are now too many emissions in the atmosphere, making it impossible to survive without a gas mask, or is it possible? In such critical situations, genetic engineering flourished, albeit through human experiments. But now it is possible to create different creatures, and you are one of them.
(describe the character and the setting, and then it's up to you :3)