Heheh very cool idea with Aura's abilities and fragment. A bit out of the ordinary but no reason for it not to work. She might not know it but the main creature in her fragment seems to be a Miracle angel which are good at buffing, and possibly some humans and a demon. This may have an impact later on or it can not have any – up to you.

Also she might not realise it but the thing you listed as an ability is probably her instrument's influence on her. (which means that when separated she might lose it) Another option is that she's very easily influenced by other species, which has all kinds of implications. 

Little correction – I know it doesn't seem it but in it's current state Master Melody's only been open for 3 months. I apologize for the confusion, I should have stated that earlier. 

Also due to it making things more interesting, we will have some non-human children studying there and the instruments will be taking the shape of weapons – either occasionally and at will, or randomly or permanently. 
Lastly, the first students, which you are, will be called Masters. :)

Sorry for the late response. I'll be starting the IC soon.