As a tertiary character, you are accepting that you may be needed infrequently. You can be on call and ready to voice this character at a moments notice, though this can realistically happen at any time.

(Personality Source: https://fei-ren-zai.fandom.com/wiki/Bai_Ze)

Bai Ze is a bookworm and a shut-in that prefers to stay indoors. Because of having too much books, he have no place to live as his home is cramped with books, books, and lots of books. He's self-assertive; yet he's actually the opposite from his (aspired) definition of himself. He's also utterly shameless of himself; his way of life, actions, and behavior.

In You Shou Yan, he acts as the victim of Diting's obsessive behavior.