If you send Violet on the dispatch mission One More Time, she will tell you that she thought she saw Poppy's dog being kidnapped by Morcubus, meaning that it's her fear (which happened at the beginning of the game).
When you send Violet on Makoto's dispatch mission "High School Yearbook", she will tell you that she's in high school, meaning that she could be between or is 14-18.
Violet has a relatively deep voice in MySims, MySims Party, and MySims Racing, however in MySims Kingdom, MySims Agents and MySims SkyHeroes, Violet has more of a higher pitched voice.
On the cover of MySims Racing, Violet is seen wearing the outfit she is seen wearing in MySims Kingdom, but in the game she is seen wearing the outfit she wears in MySims.
After Morcubus is defeated by the star racer in MySims Racing, she appears in the cut scene after the Ultimate Cup and it is presumed she quit MorcuCorp.
Violet's first and last name are both after flowers. Nightshade is a flower often associated with witches, while Violet is a common flower in the Northern Hemisphere.
In MySims Kingdom on Spookane, the lot of Grandma Ruthie's factory must have been where Violet lived before she moved to Cutopia.
In MySims SkyHeroes, she could have been a member of Specter Squadron, as she has their logo on her hat, but for the game, was made a member of SkyForce.
If you send Violet on Jenny's dispatch mission, she will reveal that she and Poppy love Starcruiser X and always watched it together.
If you send Violet on Marlon's second dispatch mission, she will mention Cutopia and Spookane wondering if they were harmed.
Nightshade is the name of a plant in The Sims Medieval that is used in some of the most dangerous poisons.
Violet is one of few sims in MySims Kingdom that lived on more than one island.
In MySims SkyHeroes, if you complete the mission 'Ninjas Flipping Out' before '1.23 Jigawatts Required', Violet will tell you that she only joined the SkyForce to protect Poppy.
Violet's description in MySims claims that she had a job as a kitten photographer, which she despised. In the DS version of MySims Agents, she owns a pet cat.
In The Sims 4, Violet appears as one of the MySims trophies that can be collected by players. She is a rare trophy and described as: Dark and dramatic, Violet Darkshade nonetheless has a beautiful heart. She does her best to take care of her kid sister, Poppy, even if it usually gives her one of those headaches that sits right above her eye.
Notably her name is mistakenly referred to as Darkshade rather than Nightshade.
In MySims SkyHeroes, she is much more sociable and optimistic than in previous games.