one’s fave/bias; a person/character whom you stan/support as an avid fan
It comes from the verb 推す, meaning “to stan”. It used to be a jargon term among idol fans, but now it’s often used among young people to describe an idol member or anime character whom they stan. Sometimes, it is also used to describe things you really like, such as your favourite restaurants.
As long as my bias is smiling, I’m happy