Fenn projects as a highly adaptable defender at the collegiate level, possessing a long, athletic frame and a laser-timed 4.64-second 40-yard dash. Armed with an explosive first step and exceptional bend, he excels as a violent edge rusher who collapses the pocket with quick hands. His elite lateral mobility allows him to erase space on perimeter runs, while his fluid hips and defensive back background give him the unique ability to drop into downfield coverage against tight ends and slot receivers.