Rodentia Ratburn

Rodentia Ratburn (also known as Miss Ratburn) is Nigel Ratburn's sister. She appeared in "Arthur's Substitute Teacher Trouble" as a substitute teacher for her brother when he was losing his voice.

At first, Arthur and his friends were afraid her teaching skills might be more difficult than Mr. Ratburn's, due to the fact that Mr. Ratburn is the strictest teacher at Lakewood Elementary School. However, after Miss Ratburn arrived into the classroom, her teaching skills turned out to be very simple, including the 1X's tables, color mixtures (such as yellow and blue make green), and puppetry. In the aftermath, Arthur and his friends proved her teaching skills were way too childish for everyone in the third grade (the Brain had the strongest opinions), and her brother finally returned the next day. Subsequently, Miss Ratburn is no longer seen after that episode.

Appearance
In her only appearance, Rodentia looked very much like her brother, except with short brown hair. She wore a cream yellow shirt and a yellow vest, along with a skirt and high-heeled shoes. Like her brother, she wears shirts tucked in.

In Arthur, Buster, and Francine's imaginations before they encountered her in the classroom, she had straighter hair and was wearing a headband and a feminine version of Mr. Ratburn's uniform.

Past life
While she only appeared in Arthur's Substitute Teacher Trouble, her appearances shown below are what she looked like in Arthur and his friends' imaginations before encountering who she really looks like, and their imaginations were completely sepia.

Personality
Rodentia is a very boring teacher with a  high-pitched voice at that. She loves to teach, sing, play guitar, among other things, and gets along well with her students. However, her teaching skills are not challenging enough for 3rd graders, suggesting that she is more qualified to teach Preschool or Kindergarten. She didn't seem very aware of how little challenge she was for her class, as she didn't really make the class much harder when the Brain remarked how childish her lessons were. Still, she remains very laid-back and cunning

Family

 * Nigel Ratburn: Rodentia is Mr. Ratburn's sister, and from what little has been seen of their relationship, they do seem to be close. In Arthur's fantasies, they were sworn enemies, dedicated to outwitting each other in every field.
 * Husband: While little has been seen of Rodentia's family, it would appear that she is married, as in the episode "Desk Wars" Mr. Ratburn learns that she just had a child; although in her only appearance in Arthur's Substitute Teacher Trouble, her pregnancy was unknown.
 * Child: Rodentia has at least one child as of the episode "Desk Wars". That day, Mr. Ratburn announced to the class that he had just become an uncle after having received a call from his sister.

Trivia

 * When Arthur is flipping through channels in "Arthur Plays the Blues," her character model is reused as a famous concert pianist.
 * Rodentia is a lot like Miss Sweetwater and Mrs. Fink in which she does a lot of fun stuff rather than true teaching. In fact, they three have the same teaching methods and both just happened to be playing "I Like Fudge" on the guitar at the exact same time.
 * In the episode, Desk Wars, it is revealed that she became a mother and she has given birth to her child, although her pregnancy was unknown in her only appearance.
 * Rodentia Ratburn is the main antagonist of the episode Subsitute Teacher Trouble.
 * Rodentia Ratburn's gender is a female.
 * Rodentia is part of the Ratburn family.
 * Rodentia Ratburn's middle name is not told of it.