Blue Rectangle is someone who chooses to just separate himself from other people, and is usually rather abrogating most of the time, usually either being apathetic or just straight up rude at times. He basically is just that grumpy person who's never happy, or on a very lucky day cracks a neutral face. The only time where he's even shown a lick of actual joviality is where he gets his own hopes up about possibly rejoining in favor of him being able to do something for once other than be a literal statue or just a Moody Judy. However his buoyancy is shut down easily when he fails to rejoin at only 303 votes in Fixing. He immediately loses his sunny side and his cloudy side returns, just saying "Figures." rather disappointedly. BR is also easily annoyed and isn't afraid to not keep it hidden, especially after Flaggy confronts Banner about how she's a "monster". Despite him being minimally to essentially not involved, he just screams at her to just shut up, and asks Towel how she even deals with these people, in belief that they're extremely aggravating to have to put up with.