Holy S**T!!!!! BRO
What the hell man. The is looking really badass!!! The design is looking epic so far. Really nice shapes and aggressive look to the character. You gotta share your references with me lol I wanna make badass characters like this as well.
The weapon idea and look is awesome. Tell me if I'm wrong, but in the illustration wip, it looks like you have your character Destroying her dark enemy by cutting them down with the chainsaw weapon.
Not sure if you'll put it in the final, but some kind a swipe and a smear effect on the chainsaw would be cool. To me that indicates the force behind the strike and how powerful the character is. Not needed at all but just a recommendation.