So a little new to the forum but rather interested in this, want to check if there are any spots free before I begin work on my sheet. For my basic idea I have something along these lines:

The magical girl in question is about 13 years old, as a child she was abandoned on the streets and to this day doesn't know who her parents are. Fortunately one of the London prostitutes stumbled upon the starving little girl and took her in, convincing the matron she worked for to let her sleep in one of the storerooms at the brothel. That is where the girl crew up as a sort of surrogate daughter of the women who worked there with them teaching her various skills like math and how to read. 

At the start of this RP this girl would be a relatively new magical girl, with her working as an assistant to the local doctor who serviced the brothel with the ultimate goal of saving enough money to go to medical school as her adopted family want her to not have to do the work they do. 

As for general powers and theme they will be based around medical things. So expect scalpels as melee weapons, maybe a bonesaw and vials of medicine for healing people.