She isn't grumpy, she just tends to be little expressive. She's ladylike but not on the level of Platinum, something more grounded.
Originally she's from Sinnoh and she's a pharmacist who deeply cares for her job and patients. Adores poison type pokemon, and while not really a pokemon battler judging by her bow usage she's physically fit and should be able to defend herself. The bow is used often to aim pokeballs or other items.
She isn't fond of tropical style clothes but wears them because that's what you can get in Alola easily. Satoshi Yamamoto says frilly clothing and plan colors is more her style.