Here are the characters

Penelope.

Chris (Penelope's big brother who gets grounded a lot).

Everly.

Allison.

Sara.

Gabe (Himself).

Molly (Penelope's baby sister).

Dora.

Justin (Penelope's next door neighbor).

Kai-Lan.

Mr. Vallet.

Allen Hernburger (A fat guy who shouldn't go 30 feet up the Percy family).

Ms. Ellie (Penelope's 1st grade teacher).

Milly and Molly (Two twin sisters that look the same but wear pink and cyan clothes).