Trevor Sandbourne is a 13 year old boy who goes to Stoneybrook Middle School (SMS) with The Baby Sitters Club members. He is in eighth grade, too, and went out briefly with Claudia Kishi, but it didn't get very far.

Trevor and Claudia had crushes on each other and went to dances together, like The Halloween Hop in Book #2 Claudia and the Phantom Phone Calls.

He is friends with Alan Gray, and was involved in Alan's scheme in Book #2.

Trevor is a poet and is often off in his own little world, daydreaming or looking for inspiration for poems.

He writes for The Literary Voice column in the SMS school newspaper.

Trevor seems shy and quiet and Claudia found him to be too much focused on his poetry writing, rather than Claudia herself.

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