Toxoligy

After you were saved from that robot you discovered your mutant power was the immunity to poisons, toxins, or ****. This means you are immune to all **** including coffee and booze but it also means you can win any and all drinking competitions. Later you also discovered if you consentrated enough you can produce any and all of the toxins you absorbed but only that amount. After some trial and error you learned you can also mix the said toxins. It caused you to study and learn about what types of toxins were in everyday objects. They can be very helpful. After nearly two years of training by the X-men, you decide that you want to fight crime your way. Luckily later that week of stopping petty thefts and purse snatchers you find a weird help wanted add by your doorstep looking for a sidekick. At least it is from some attractive superheroine.