He is shy and wary when you first meet him, due to him being mistaken as Error many times. When you get to know him, though, he is snarky, sarcastic and a bit ornery.
Gradient has greyish purple bones, red pupils, turquoise "tears", similar to Error, and green teeth. His fingers are like Error's. He wears a black and blue jacket, long brown pants, tiger print shoes and glasses. He has a red jacket tied around his waist, which holds a paper pad and a pen.