Doris Tollar, is Caillou's primary caregiver, she often tells Caillou she is too busy to do anything with him or Rosie. Nevertheless, Doris typically spends time with them in every episode of Caillou.
Doris is a very strict and stubborn person. Like Boris, she always grounds her son Caillou. However, after the events of The Christmas Chronicles series, she stopped doing this and began treating Caillou with love and care again. She manages the family's bills and finances, as mentioned in the episode Caillou's All Alone when Doris told Caillou that she was too busy counting bills to play with him.
Doris has tan skin, brown eyes, and brown hair with a blue hairbow. She wears a red jacket with a yellow scarf, blue jeans, and blue slippers. In Caillou, she wore a red sweater with a yellow border.