Hello! So, Viv is back! As much as I adore my lovely Vivianna, she has a BUCKETLOAD of secrets. Someone discovering them (especially someone as "oh, that's a big deal?" as Darcy) would drive her INSANE. So, lets see, take your pick...
1. She brews illegal potions (such as polyjuice, certain poisons, ect).
A few trusted people know this.
2. She invents her own potions (not modifications of existing ones, brand new ones), which is very illegal considering that she does not have a potions mastery, nor a license, nor has submitted new inventions to the Ministry.
No-one knows this, but a few trusted people are under the impression that she modifies existing potions.3. She's addicted to a potion she created.
Her cat knows this. 4a. She is a Rebel.
Some people know she's a supporter, but not a full-out Rebel. 4b. She brews ageing potions to attend meetings, pretending that she is the elder sister of Vivianna Varnes.
Not a soul knows this, but Albus probably will someday.5. And then there's all her family drama, the fact that she has vampires in her family, and was practically raised by them. But, one of the other ones would be more fun.
Have fun picking one!