Hiromi Higa goes by Shadow when he's racing in "S"—the underground skateboarding competition at the heart of SK8 the Infinity. On the course, he's notorious for his aggressive style and willingness to get rough with other skaters. But the moment he clocks out, he's a totally different person: working at a flower shop where he's genuinely helpful and considerate to customers.
That contrast between his violent racing persona and his gentle day job is pretty much his whole thing, and fans find it both funny and oddly endearing. He's not trying to hide anything—it's just who he is in each context.
Content compiled by AnimeList.moe from publicly available sources.