[quote=@TheWendil]
[@Villamvihar]

Her magic and weapon are fine but I have a few questions about her backstory. Just so I'm understanding this right, are Sylvia and Chiaki two personas for one girl? Were Hotaru and Ember real too or were they just figments in her mind?
[/quote]

All of them are personas / separate personalities that only exist in her head. However, she does see them as though they were real people.