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.
In Shrek 4-D
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.