Rich Aunt Ruby is Steve’s Mother, Mum‘s sister, Dad’s sister-in-law and Henry and Peter’s Aunt. She is regarded as rich and often buys Steve expensive gifts for Christmas. She also lives in a rather large old house with Steve. She is often seen as quite grumpy at times.
She wears a magenta suit, white shirt and magenta skirt in Horrid Henry. She has burgundy-magenta hair. Horrid Henry sleeps in the attic bedroom when he comes over for the weekend. She is also shown in Happy Birthday Steve. In Horrid Henry's Perfect Day, Peter throws spaghetti at Mum. In the Episode, Ruby said at the fair, "Henry was sick on my carpet!" .