Knapsack Kid is a mysterious and intriguing character from the series 'Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai'. Known for his peculiar appearance, he is often seen carrying a knapsack. Although not a central figure, his appearances are significant, often leading the main characters to key revelations about the supernatural phenomena they encounter. His role is shrouded in ambiguity, leaving both the characters and viewers guessing about his true identity and purpose within the storyline.