I was wondering if there were any idioms or cliched metaphors commonly used to describe someone who you can always expect to see in a certain place because they spend a lot of time there (or even better, creative metaphors!).
And more specifically, I am looking to describe a chessmaster who's always chilling in the break room at the chessboard.
Perhaps phrases containing 'perennial tree' or 'rock' or 'staple'? But I can't quite arrive at a good metaphor from them. Would appreciate any help!