Wandered again in various worlds and I ended here(via the Stone World). I discovered that the "smoking lady" -I always felt that is was more of a genderless robot wearing a belt and holding a thunderbolt, by the way- turns into something totally different when the Marginal effect is equipped. I could also lure the small robot with red eyes with the same effect.
The first screenshot shows the normal NPC; in the second, the same NPC all transformed and the blue robot lured from its position.