The Daliwakans were mainly Human in appearance except for a row of ridges down the center of their forehead, and pronounced skin above the eyebrows. Daliwakans have successfully mated with Humans before.
There was a hologram (presumably of a real person) that was half Daliwakan on his mother's side, and his father was a Human of French descent. He was in Tom Paris' holodeck program depicting Chez Sandríne. (VOY: "The Cloud", "Lifesigns")