Helen

4th Grade Female Cat is an unnamed fourth grader who first debuted in the episode Arthur's Eyes. She has always been seen in the background of most of the episodes and has not spoken at any time in the show.

She did play a role in the show, which took place in the episode D.W., Bossy Boots, when she attended Emily's birthday party. The relationship between her and Emily is a mystery though it's most likely she was just invited.

She does hang out with mostly fourth graders, but is seen hanging out with third graders like Jenna. Her personality is also unknown, but she appears to be nice to all the other kids at school.

She is also in the same fourth grade class as Prunella as seen in the episode Prunella's Special Edition. She is most of the time seen either in the hallways or at lunch.

Most of the time when she appears she's often with her best friend 4th Grade Female Rabbit. Outside of school she is seen at the library, ice cream shop, and other places around Elwood City.

Appearance
4th Grade Female Cat is a cat with a brown complexion. She wears a cream colored collared shirt, yellow sweater with long sleeves over her cream colored shirt, a purple jumper with pink pockets over her sweater, long pink socks, and pink and white sneakers.

She has brown hair in the form of a Bob cut. She has been seen with a yellow backpack and then a green backpack. Later on in the series she has been seen with a blue colored backpack.

She also wears an orange sweater with a yellow "P" on it. She's been seen wearing yellow, green, and blue colored backpacks in other episodes. When she was in kindergarten she wore a sweater with sleeves and buttons, a gray dress, and white Mary Jane type shoes.

In the episode Arthur and the Real Mr. Ratburn she wore a beige shirt, pink shorts, long white socks, and pink and white sneakers during the basketball game and even was seen wearing the same clothes during the puppet show later on in the same episode. In the episode, Love Notes for Muffy she is seen wearing pink shorts and a pink shirt.

Trivia

 * She is in the same class as Prunella Deegan though it's unknown if she's friends with her or not.
 * She is a fan of Henry Skreever along with her friend and Prunella.
 * She most likely met her friend 4th Grade Female Rabbit at some point during kindergarten or at the Elwood City Preschool.
 * During her year as a third grader she was in Miss Sweetwater's class as seen in the episode Arthur and the Real Mr. Ratburn. However in the episode Tipping the Scales she was seen with Binky during last year's performance at Crown City, which means she was most likely in Mr. Ratburn's class during the third grade.
 * While she has never spoken before she, her friend and 3rd Grade Male Dog can be heard laughing at the information D.W. gave them about Arthur.
 * According to what Arthur said in the episode D.W.'s Imaginary Friend 4th Grade Female Cat is apparently D.W.'s friend. As to how or why that is the case is a complete mystery, but it can be assumed she is Arthur's friend as well and met D.W. through Arthur.
 * In the episode, Love Notes for Muffy she was incorrectly mistaken as a 5th grader along with some or all of her classmates.
 * She, Steve, 4th Grade Female Rabbit, and 4th Grade Male Rabbit were all seen in the commercial for Moon Boots. She would be seen in another commercial for the t.v. show Let's Talk to Some Kids, which took place during the episode And Now Let's Talk to Some Kids. This could mean she or her family in general maybe involved with commercials and advertising in some way.