Len Tohno is a mysterious and quiet girl from the Melty Blood series, a visual novel and fighting game adaptation of Tsukihime. Len is a powerful dream familiar, originally created by Aoko Aozaki, and serves as a key character in the story, often involving herself in the dreams and subconscious of others. She assists the protagonist, Shiki Tohno, and plays a vital role in unraveling the supernatural events that occur throughout the series, making her an enigmatic yet important presence.