Ash has brown hair and red eyes with some freckles. He wears a green hat, a black shirt, dark grey pants and red shoes. Without his cap, his hair resembles his father, Zack. His voice is similar to Charmy from Sonic the Hedgehog games, albeit slightly lower in tone.
As an adult, Ash wears black penny loafers, black suit pants, white shirt with red tie, lighter brown vest and an investigator coat.
Ash is a friendly and polite person with very good morals and judgement. He is shown to be very artistic and creative at drawing and is a quick learner and good listener. When talking or chatting to people, he sometimes uses formal language. He is shown to be a disciplined boy as well.