It was about time I'd made a fire controller, too. I had been prejudiced against fire sets for a long time; I cannot explain why. The SG allowed whatever secondary you wanted; I chose Sonic Resonance – a set I knew I liked. I was thinking once she got her fire imps at level 32, providing them the sonic shields would enhance their survivability. As it turned out, @Greta's SG soon dwindled to nobody but Echo, and she never made it that far.
The costume pieces are mainly from the bioluminescence set. They give her a really unique and sinister look, IMO. The bright red "lava" lines would shimmer. I probably would have eventually aligned her as a vigilante. She just doesn't look like a hero.