Here is a wonderful example of character description using alliteration, voice and wonderful adjectives. It's taken from "George's Marvellous Medicine" by Roald Dahl:
"Most grandmothers are lovely, kind, helpful old ladies, but not this one. She spent all day and every day sitting in her chair by the window, and she was always complaining, grousing, grouching, grumbling, griping about something or other. Never once, even on her best days, had she smiled at George and said: 'Well, how are you this morning, George?' or 'Why don't you and I have a game of snakes and ladders?' or 'How was school today?' She didn't seem to care about other people, only herself. She was a miserable old grouch.