I did a quick sketch of her design since it’s one I’ve had in mind for a while now:

– She’s Sonia and Nessa’s only child and is an aspiring scientist like her mother and great-grandmother. I can see her focus being on marine pokémon thanks to all the time she spent with Nessa’s pokémon and by the water growing up.

– She’s got a fair amount of admirers, but dislikes the attention since she’s sure they’re all only interested in her for superficial reasons like her looks or because her parents are famous. She’ll shut down anyone who seems like they might be a fan which has led to her getting a bit of a reputation for being “cold” (also thanks to her RBF lol.)

– Her best friend is Nasrin (Leon/Raihan/Piers) and the two have known each other since childhood since their parents of course are all friends. Nasrin is also fairly serious like Susanna is, so they get along well and often will hang out together when Nasrin’s not busy training to try and beat Champion Victor.

– Her starter is a Feebas she caught with her mothers’ help in the lake behind her great-grandmother’s house on Route 2. I thought it would be cute for her to befriend one after watching the Twilight Wings episode focusing on Nessa. Susanna doesn’t battle, though, so her Milotic is more of a research assistant. She’ll often ride Milotic in the water while studying aquatic pokémon in their natural habitats. 

SEND ME A  🖊 AND A CHARACTER AND I’LL WRITE OUT SOME HEADCANONS FOR THEM!