Gremlin is one of the operatives of M.A.Y.H.E.M. that can be found at the main headquarters. She is responsible for some of the technology advances that the agents employ out in the field, and agents can outfit themselves accordingly before departing.
One of her more controversial inventions is the "PED Explosion", which allows agents to tag pedestrians at will. After a certain amount of time, the pedestrian then explodes.