Streber has black hair and, in his vampire costume, is seen wearing eyeliner, fake fangs, a white collared jabot with a burgundy overcoat, and black pants. His cape is black on the outside, and lime green on the inside. After being attacked by Bob, he is seen missing his left forearm. Streber is a very smart and enthusiastic character who puts a lot of time and effort in the things he loves. His projects seem to make him very happy, as he's typically cheerful when talking about them and showing them off. Despite him seeming to be a happy-go-lucky character in his first appearance, it is revealed that that was all an act as he is shown to be much more serious and snarkier in everyday life. In Streber’s Rehearsal, he does not appreciate his friends goofing off while he is trying to work, going so far as to hush Ethan when he told him, "You put a lot of effort on this. I mean, it's just a haunted house.” He also throws his notebook at Ethan, Liv, and Leon after they teased him.