You can raise corruption or love by talking to characters, complimenting them, and flirting. Just make sure to click on the NPC when they appear in the scene—interactions only unlock once you select them.
Currently, there are two main characters: the Landlady and her daughter. In addition, all NPCs are assigned one of three distinct personalities: Naive, Independent, or Timid (exclusive). I plan to make the daughter publicly available once I’ve completed the Childhood Friend character.