The hallmark of an NPC in romance is reactivity , not action. You wait for someone to select you from a dropdown menu. You wait for a protagonist to notice you standing by the potion shop. You let other people write your love story, and you end up as a footnote in theirs.
: The "Kun" update adds dedicated storylines for specific new NPCs, often centered around a school or domestic setting depending on the chosen path. npc sex welcome to parallel world v10 kun upd
Romance flags become available , but the player must choose to pursue them. The hallmark of an NPC in romance is reactivity , not action