Katherine (Season 31)

Katherine is a 13 year old female who lives in Danville. Her first appearance was in the Season 31 episode, New Girls in Town. She has brown hair with hazel eyes. However, she is a bit on the short side.

Phineas Flynn
Katherine is good friends with Phineas. They stick together, but they never really talk that much, but Phineas will help Katherine no matter what.

Ferb Fletcher
Katherine loves Ferb with all of her heart. Ferb is her boyfriend and she'll do anything to make sure her little Ferb is okay.

Isabella Garcia-Shapiro
Katherine is pretty good friends with Isabella. They hangout quite frequently, especially when they are at Phineas and Ferb's.

Buford Van Stomm
Katherine puts up with Buford every day. She really hates him. A lot.

Baljeet Tjinder
Katherine doesn't mind Baljeet. They never talk at all but just say Hi to each other every once in a while.

Candace Flynn
Katherine is never around when Candace is, so they have no idea about each other.

Django Brown
Katherine sort of has a crush on Django. But she remembers she is dating Ferb.

Irving Du Bois
Katherine doesn't mind Irving. When she has a technological question, she always goes to Irving first.

Bailey
Katherine and Bailey have been best friends since forever. They will always stick together like peanut butter and jelly.

Kenzi
Katherine and Kenzi should be voted Best Friends of the Year. Or the century. They are the best best friends anyone has ever seen.

Jenna
Katherine knows that Jenna is sometimes left out of social conversation, so Katherine always tries to go out of her way to talk to her. What a kind girl.

Hannah
Katherine and Hannah sometimes hangout. But whenever Bailey or Kenzi isn't available to hangout with, she goes straight to Hannah and they party like its 1999!

Lauren
Katherine never really pays attention to Lauren. Lauren has the same situation as Jenna, but Katherine never notices.

New Girls in Town
Katherine arrives to Danville with her friends.

Journey to the Center of Kenzi
Katherine goes with her friends inside Kenzi's body to retrieve a mini bomb that Kenzi accidentally swallowed.

Where's My Perry, and to a Further Extent, my Water?
Katherine is a part of the search party to find the water, she also wants to try and drink the contaminated water.

Lasting Memories
Katherine buys one of the cameras, but is also one who wants a refund.

Here to Stay
After decision and some brief conversation, Katherine and her friends stay in Danville.

Phineas and Ferb: Katherine's Inside Crisis
A main character in the episode. Doofenshmirtz invades Katherine's body so her friends go into her stomach.

Into the Depths of Jenna's Digestive System
Katherine is one of the many few to go inside of Jenna's digestive tract to remove some raw food from her body.

The Grand Easter Egg Hunt
Katherine participates in the hunt, and Hannah finds an egg on Katherine's uvula.

Left Ahead
Katherine, Ferb, Bailey, and Baljeet lose Phineas, Lauren, and Buford while they go on a quest.

Katherine and the Tonsil Problem
A main character in the episode. Katherine's throat begins to hurt because of her tonsils, so her friends go into her mouth to find out.

The First Ever Phineas and Ferb Sing-Along Show
Katherine gets a line in the song "Jenna's Stomach" as well as appearing in the main plot talking about how to deal with younger siblings.

Snapchatters
Katherine is a part of the big Snapchat group. She is seen snapping Ferb, Ford, Emily, Hannah, Haven, and Megan.