I'm going to go for
Blitz88. Decent sig, i like the neon effects on both sides of the render, captures the theme nicely. More effects on the render itself would have made the sig perfect.
Glory's sig was okay but i didn't like two things. Too bright and the rough effect looked overdone.
Piney's sig lacked the baisc ingredient. Depth. Totally took away the focus with the finihsing touch of that neon light thing across. Also there is the trouble with the flow. The bg point to one direction while the neon effects point to another.
Roza's sig was way too rough and looked incomplete. And very simple. And I don't get how she can prove that her sig was according to the theme itself

Knowing her abilities, this was only 10% of her true potential. Even less maybe.