Milly Harper

 is Jenny's little sister and Peanutjon's version of Milly. She is a member of Isabella's Fireside Troop.

Personality
Milly is very kind, and occasionally can be too helpful, annoying everyone else.

Isabella
Milly respects Isabella, calling her "sir" or "ma'am". However, she doesn't hang out with Isabella a lot.

Django
Milly has a crush on Django, who doesn't know this. Milly thinks that Django dislikes her because he is easily annoyed, which makes her angry.

Phineas
Milly helps Phineas and Ferb a lot. In fact, she has helped them one more time then anyone else, where she went back to help them unlike the others.

Ferb
Milly helps Ferb and Phineas a lot. In fact, she has helped them one more time then anyone else, where she went back to help them unlike the others.