Justin has a moderately heavy build, blond hair, blue eyes, and a thick chin with a small cleft. He wears an orange shirt with a small white crown on the right side, gray slacks, gray and black shoes, and orange/black striped wristbands (sometimes on one arm, other times on both).
- Theme Song (season 1)
- Star Comes to Earth
- Match Maker
- School Spirit
- Monster Arm
- Brittney's Party
- Mewberty (cameo)
- Freeze Day (cameo)
- Interdimensional Field Trip
- Mr. Candle Cares
- Starstruck (cameo)
- Girls' Day Out (cameo)
- Naysaya (cameo)
- Collateral Damage
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- On the Awesome Opossums Football team, Justin's jersey number is 7.
- He likes to eat oysters, as shown in "Brittney's Party."
- Justin shares the same first name as Justin Towers, of Love Sentence.
- Justin's last name is revealed to be Armberg in Star and Marco's Guide to Mastering Every Dimension.
- Star and Marco's Guide to Mastering Every Dimension by Dominic Bisignano and Amber Benson. March 7, 2017. Published by Disney Press. Page(s) 58. ISBN: 978-1484774199.