William T. Spears (ウィリアム スピアーズUiriamu Supiāzu) is a supervisor from the Dispatch Management Division of the Shinigami. He is also, briefly, part of the Noah's Ark Circus, where he goes by the stage name Suit(スーツ Sūtsu).
William is emotionless and generally calm. In regards to his job, he is strict, follows the rules precisely, and seems extremely devoted. He does not take kindly to individuals who cause problems or create more work for him, particularly if it forces him to apologize for their actions. Nonetheless, he seems to share Ronald's distaste for overtime work.
He has no qualms with inflicting minor injury on others, as shown when he jumps off a roof to land on Grell Sutcliff's head and when he uses his death scythe to attack Sebastian on a few occasions.
He finds demons to be disgusting creatures, and is seen calling Sebastian Michaelis a variety of names, including "devilish fiend," "leech," "hound," and "vermin." However, it is implied that he finds other demons to be even more abhorrent than Sebastian. In the anime, though, he is much more willing to work with Sebastian, as he aids him on a number of occasions.
However, he does not seem to like anyone very much, as Ronald comments that William is disappointed to see him, and he insults a variety of individuals, including Grell, Sebastian, and Ciel Phantomhive. In the anime, though, he does show an amount of respect and admiration for Undertaker, although Undertaker does not seem return these feelings, calling him "annoying and noisy".
William has short, neatly-combed, black hair, green eyes, and wears rectangle-shaped glasses that have four decorative lines on each side of the frames. He dresses in a nice black suit, tie, black gloves, and dress shoes, similar to Ronald Knox.
When he infiltrates the Noah's Ark Circus as Suit, he wears a yellow suit jacket, purple pants with stars on the bottom and spotted tie. When he performs as Suit, the suit jacket is changed to being covered with a star pattern.
He almost always displays a near-frown on his face.
As a trainee, he is shown to have messier hair, similar to that of Alan Humphries, but wears the same clothes, save the glasses, which are trainees glasses.