Auraninja
Eh, ragazzo!
I get the vibe that she would be more of a "Brock" type of character where she is sensible and mature most of the time.She's a Gym Leader type character in a game generation where there aren't any gyms in the first place.
That automatically expands her horizons by default.
Compare that to Misty, May, Dawn, and Iris where they all have some weird tick or two with them. Serena seems more chilled, but she was made to be a peer to Ash (as Bonnie was meant to be a younger character like Max).