Is there anyone who I should play from your canons?

Hmmm... You already have Masamune from IkeSen...

I do and I'm still surprised he stuck

Miranda from Legend of Dragoon would also be a good fit for you as well.

what's she like?

She the dragoon of the white silver dragon, so her power is opposite of Rose's. But she's just about the opposite of the trope for a "white mage" personality wise.

... unsure of what that means but I'm thinking I should try and find a rom of the game to play or something

She the adopted daughter to this one queen, so when you first meet her, she barking out orders to a bunch of knights.

And at one point in the game, she actually punches Rose.

So definitely not the "delicate healer who uses white magic" type of character.

I'd probably have fun

Rose can testify that she has a mean left hook.