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Good:
>She's hot
>She's pretty
>She's a unique take on a water-type gym leader
Bad:
>Her personality isn't very interesting
>Her shoes are weird
In general I feel like gym leaders tend to be better in terms of character design than writing.
They have a ton of effort put into how they look but their role in the story is usually just to be a minor challenge for the player to overcome on their inevitable path to being the best trainer ever.
It's a shame because I feel like gym leaders are one of the coolest parts of the series.
I think the games would be better if you fought each gym leader two or three times before eventually earning their badge, with them having a small arc over those battles. That's kind of how Giovanni works in Gen 1 and I always thought that was one of the coolest fights of the whole series because of that.