I think I like 5 the most from those, perhaps 1. But they are all pretty fun.
Thanks 
! Yeah, the 5th one is great as well! I will probably create a mix of the best ones.
Sure it can be more evil! I think most people would like to see a character with exaggerated hero or villain qualities and id love to see how your concept matures from here. (could also just be a case of being a rough sketch waiting to be refined, anyways keep it up!)
I do recognize that one as being more victorian, the frills and the black spots highlights the evil aspect a bit without going overboard. And I would think that she would try to hide the evil side of her as well. So perhaps you can keep it subtle and put the evil through entirely in her expression and use of power (like roasting someone). Give a creepy proper lady vibe.
Keep at it!
Thank you :)! Good idea, that is exactly what I was thinking 
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4, the green would be a nice color contrast with the fire superpower.
check out triss from the witcher, she has a nice color scheme that compliments well her braise hair . If you want to push your design, flesh her personality a little more, and have it be reflected on the costume. Is she arrogant ? shy ? does she want to live concealed ? or burn the whole world (the latter considering your story) ? And use shapes and clothes to make her more extravagant or trying to avoid people's gaze. Does she want to be seen as human or is she trying to resemble more to a monster ? Maybe she identifies more to her crow than other people, if that is the case, she would probably prefer looking closer to the animal
Hope it helps
Thank you so much for your great feedback :)! I am trying to make her costume have crow elements. That crow is her only friend and the only living thing that she can relate to and find comfort it. I do agree on the green color scheme with you. I am currently working on the turnaround sketch and I am planning on adding more details and personality to her costume. Thanks again! 
Victorian Venice, nice. 
Right now I don't feel it is evoking the resentful personality of the character, it could help changing her facial expression to a more hateful one. Or if I'm not too late, thumbnails 2 and 5 accomplish your backstory better.
Good luck anyway!
10 days later
Thank you, for your feedback! Her expression did need a slightly more devious expression lol, thanks for telling me
