Kaitlyn Hart

, or Katie, is a member of the Fireside Girls Troop.

Personality
Katie is optimistic and likes to help out friends. She gets everything done ASAP and can do almost anything she puts her mind to.

Isabella
Katie respects Isabella and calls her ma'am or sir, similarly to Gretchen. However, she isn't as close to Isabella as the others.

Adyson
Katie is close to Adyson, but not very. They interact a lot.

Gretchen
Katie and Gretchen are best friends. They're together a lot and love hanging out at meetings with Alice.

Holly
Katie and Holly are mortal enemies. They'll do anything to make each other angry.

Ginger
Katie and Ginger are very close, occasionally making Gretchen and Alice jealous. However, Katie knows that Gretchen and Alice are her best friends and hangs out with them more.

Milly
Katie and Milly occasionally hang out, though not much.

Rosie
Katie feels sorry for Rosie, as her parents died, but they don't interact much.

Alice
Katie, Alice and Gretchen hang out a lot. They sit together at meetings and all try to get the same patches.

Phineas
Katie helps Phineas and Ferb, like the other Fireside Girls. She admires Phineas' optimism and creativity, which occasionally makes Isabella jealous.

Ferb
Katie helps Ferb and Phineas, like the other Fireside Girls. She doesn't interact with Ferb as much as she does with Phineas.