Karin Astray is Joshua Astray's deceased older sister in the Trails Series.
A kind and gentle young girl, Karin lived peacefully in the days with her younger brother, Joshua; and boyfriend, Loewe. But the peaceful days came to an end when the Tragedy of Hamel befell upon them. She tragically died after being stabbed to protect Joshua, but gave him her harmonica after dying in Loewe's arms.
- Before her death, she always plays "The Whereabouts of Light" on her harmonica, now as Joshua's memento of her.
- She has a pseudo-cameo when Joshua cross-dresses.
- After defeating the Schwarzritter in Trails in the Sky the 3rd, she can be seen besides him as a minor illusion to bid farewell to Joshua.
- According to Estelle and Joshua, Kloe is similar to Karin in terms of personality.