This character engages in flirting with other characters.
Flirting is a playful, romantic or sexual overture by one person to another subtly indicating an interest in a deeper relationship with the other person, and can involve verbal communication as well as body language. Body language can include flicking the hair, eye contact, brief touching, open stances, proximity etc. Verbal communication of interest can include the vocal tone, such as pace, volume, intonation. Challenges (teasing, questions, qualifying, feigned disinterest) serve to increase tension, test intention and congruity.
Almost every VN has some romance and relationships, but rarely they do have actual flirting. Use this trait sparingly for only the ones that actually do.