• Krystal is Shadow Berry's sister

• When they were younger, Krystal and her twin were always mean to Shadow Berry

• They were also initially "evil"(evil is in quotes because they didn't exactly do "evil" things, just things that were really bad)

• But, over time, they started to change, and all three of them had a better relationship with each other

• No one knows exactly where Krystal is now, but Shadow Berry and Krystal's twin think that she's traveling the world like they are

• Krystal is a Dark/Ghost type