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◐ cast of characters ◑
[imagine them as you like; these are just suggestions]

Alfie Templeman as Trevor Jettison

Abby Ryder Fortson as Lally Jettison

Marius Listhrop as Louie Steffenson

Amandla Stenberg as London Steffenson

Olivia Cooke as Kaye Montgomery

Dove Cameron as Sage Dewirth

Avril Lavigne as Emma Grange

Park Jiyeon as Cassidy Jeong

Emily Meade as Gwen Bellingham

Ben Barnes as Diego Navarro

Whiskers
(as suggested by Basilisk_Flaxen)

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Thank ya'll for helping me pick them!