|Appearances||Layton's Mystery Journey|
|Voice Actors|| Japanese:|
|Relations|| Hershel Layton|
Katrielle Layton is the protagonist in the upcoming game Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy. She is the daughter of Professor Layton, and is a detective based in London. She is assisted by a talking dog named Sherl, and works to solve various cases around London.
Katrielle wears a red dress with a black bow around the waist, dark leggings, and a beige trench coat. She also wears blue shoes and a small beige top hat held by a headband. She has large blue eyes and curly brown hair.
While not much is currently known about Katrielle, it is said she began working as a detective in order to find her missing father, but gradually took on other cases around London. With each day, the search for her father had not progressed.