Fukawa Toko is known for her duality as she operates under two distinct personalities. Primarily, she is shy and anxious, often struggling to connect with others. However, she transforms into 'Genocide Jack', a confident and murderous persona, when triggered. Toko has a deep passion for writing, particularly horror stories, which reflects her complex psyche. She often feels insecure and is very critical of herself, yet her talent shines through her works. Despite her fears and challenges, Toko's character develops significantly throughout the series, showcasing her journey of self-acceptance and growth amid the chaos surrounding her.