I'm on the opposite side, I think she'd be a Shadow magic user. Hence Janus becomes Magus, like trying to imitate her or follow in her legacy or something. If I remember correctly, Queen Zeal also deals Shadow damage. Also, the seal she's made to cast on the portal looks an awful lot like Dark Matter (the triangle/pyramid thing).
That said, it would only make sense if she replaced Magus instead of adding her as an 8th character. But still, she's supposed to be more powerful than him. So instead of Light 2/Fire 2/Ice 2, maybe she uses Luminaire/Antipode/something else. And a Revive for good measure.
I think the biggest question would be what weapon she equips.
Gloves. No animations needed, just a palette swap on the hands.