Kevin is a character who made his debut in "Alone Together". He tried to get Stevonnie to dance with him before he knew Stevonnie was a fusion consisting of two children, Steven Universe, and Connie Maheswaran. Since then, Kevin has appeared to act as an antagonist to Steven and Connie. Kevin has short dark brown hair and dark brown eyes. In "Alone Together", he wears a reddish-brown jacket over a magenta red shirt with a white stripe down the middle, along with a white infinity scarf. He also wears dark-teal skinny jeans and short boots (the same color as his jacket). The colors of his outfit looked different in "Alone Together" because of the party color palette, due to which the colors being mostly the same as Stevonnie's outfit - additionally he is about the same height.
Kevin is a very condescending and narcissistic guy, and as such, thinks very highly of himself. This is emphasized when he flirts with Stevonnie, saying that they were "angels among garbage people". He is also inconsiderate, completely ignoring the fact that Stevonnie did not like him and wanted to be left alone. He is also quick-tempered, as seen when Stevonnie ignored his various sarcastic remarks during the race in "Beach City Drift". Kevin is shown to be sadistic, telling Stevonnie that he is always a jerk because he has a sick little brother, but then says that is a lie and explains that acting like a jerk is funny to him.
Kevin appears to adore being in the spotlight. In order to have people remember that he throws the best party, Kevin invited Steven and Connie to one of his parties in "Kevin Party" with the hopes of them fusing into Stevonnie, unaware that the two weren't talking to each other at that time. When he finds this out, he gives Steven manipulative advice to win her back, which involves ignoring Connie at the party in an attempt to show her that Steven is perfectly fine without her, so that she'll miss him enough to come to him. Kevin successfully manipulates Steven until the latter finally realizes that Kevin's advice is wrong.
During this time, Kevin advises Steven not to dump his "emotional honesty face" on Connie, since that might freak her out, and "it'll be Sabina all over again". Steven questions who Sabina is and Kevin immediately begins blushing, implying that at some point in the past, Kevin was more of an emotional person but got his heart broken for being too sensitive (which could also explain his present insensitive personality).