I really don't like the idea of him killing his own teammates. Wasn't the idea I was going for. Division B got wiped out in a way I'll explain later. The natural immunity to some poisons is fine, but I really do believe that literally killing your teammates is a wee bit far to ultimately be replaced onto teams. It wasn't a 'training accident', either. Regardless, it should also be noted that I don't believe this character is as much of a "gifted problem child" as he simply is just a well-trained kid with some good abilities. There are others whom have been described similarly, so he's not a prodigy, especially not at fourteen. He is, however, a step above the norm, but again I will credit that due to his training and age. He's, if anything, proficient.