Lunar is really very good at keeping characters consistent. Or at least the Lunar games I've played. Dragon Song can go die in a fire. But since that game doesn't contain any of the Lunar characters I play, it's not a worry. Closest thing I can really think of is Mia actually fighting to kill, but she has mentioned in the game that she finds nothing cheerful or exciting about the experience and that she is simply doing her duty. Any time she's fought in another world, she was doing what she believed she needed to do for a friend or, in some situations, self defense.

Frankly, I'm probably worse in messing around with Mia's character under the guise of her growing up.