Hanna Jarvinen is a Finnish character featured in *Diamond Daydreams*, connected to Suomi Kitano's storyline as her friend from Finland. She first appears in episode 7. Her role becomes central in the unaired episode ~Finland & Asahikawa~ Suomi Kitano, positioned between episodes 7 and 8. This episode, later included in the official DVD release, provides closure to Suomi's story. Hanna represents a significant past relationship from Suomi's time in Finland, driving Suomi's character development and emotional resolution within the themes of friendship across cultural distances. Her Finnish background contextualizes her interactions.