A three-star defensive end recruit, Littleton quickly saw the field at Washington, starting 15 games as a rush end his first two seasons. He moved to linebacker as a junior and was a part-time contributor in 2014 before taking over a starting role as a senior, finishing with 65 tackles, 11.0 tackles for loss and 6.0 sacks in 2015 to earn All-Pac 12 Honorable Mention honors.
Littleton is an athletic mover with the play speed to run down the ballcarrier, showing lateral agility and burst to stick his foot in the ground and easily redirect. He has the natural bend off the edge to rush the passer, but he lacks the core strength to match up from a power perspective with the big boys in the trenches, which especially shows vs. the run. Littleton doesn't flash the desired instincts to play in reverse and lacks true coverage experience. Although his athletic skill and length are enticing, Littleton has an unassuming build with tweener traits that could leave him in no man's land in the NFL.