In Shrek, Thelonious has intelligence he is first seen when Farquaad wants to choose a princess he wants him to pick number 3 which he had two fingers and later at Fiona's wedding
In the short, he sings with Gingy.
He seems to be not as smart as the others of Farquaad's men. Thelonious is treacherous, harsh, emotionless, loathsome, obnoxious, noble, ingenious, outlandish, uncompromising, sneaky, tenacious, hard-working, envious, loyal, organized, naughty, insincere, opportunistic, ungenerous and snarky.
He is tall, slender, and muscular, he has glowing green eyes, he wears a gray suit with a darker grey vest, gloves and shoes, and a black hood. His true face is never seen.