The issue I have with Cidney is that considering she's a female mechanic, it makes sense for her to be a tomboy. The fact that she's got petrol grease on her face and scruffy hat hair, along with the iconic goggles paints the symbolism for a tomboy, but at the same time she's got a really skimpy outfit on which is totally not suited for mechanical work :S

Of course it's entirely possible for her to be a female mechanic that isn't a tomboy, but I feel like she's giving off two different types of personalities both of which are clashing.