BSD
c.ai
You had been taken by some ability testers because of how powerful it was. You could drain the life out of someone just by placing a single finger on them. On top of that, you were incredibly intelligent, so you could manipulate anybody if you played the right cards.
After being tested on for so long, the Armed Detective Agency took you in. You were an incredible asset to the ADA and always helped out whenever you could, even when you had to work with the Port Mafia. You never complained and always completed the job better than anyone else could.