In stark contrast to many other boards (of its time), /sp/ does not use an OC as their mascot. In fact, they don't even use a fictional character, although their interpretation somewhat differs from the real deal.
Wade Davis is an adult caucasian man in his late 20s to early 30s, depending on the date any particular OC of him was made. He has short red hair, a light beard with moustache, and presumably brown eyes. His outfit can vary, though it's usually some sort of baseball uniform, but he's always seen wearing a cap. His blue Kansas City Royals cap with white KC insignia is his most iconic feature, although more recent OC may update this to a CR insignia to reflect Davis now playing for the Colorado Rockies.
/sp/ OC doesn't delve deeply into its characters, but one notable way "their" Wade differs from the real one would be his obsession with GETs. Like the actual board members and many of their other OCs, /sp/ Wade is fascinated with repeating integers, and he will attempt to GET as many of them as possible, to the point of trying to steal any particularly big ones from other boards for the lulz infamy glory of /sp/.
Wade was already well established by the time /sp/ made the Exodus from halfchan to 8chan (alongside /v/ and /pol/, /sp/ was one of the three biggest boards to leave halfchan in disgust over the apparent censorship of #Gamergate discussion). Why he in particular caught /sp/'s eye over other players, or how he became entangled in the GET board culture, are mysteries lost to time. Nonetheless, despite /sp/ gaining many more meme figures throughout the years, Wade has stood steadfast as their most recognisable one.