The Cat in the Hat, Horton Hears a Who, The Lorax, etc. by Dr Seuss (Theodor Seuss Geisel) - childhood favorites
Goosebumps (multiple) & 99 Fear Street: The House of Evil (trilogy) by R.L. Stine - elementary school favorites
A Series of Unfortunate Events (series) by Lemony Snicket (Daniel Handler) - I still enjoy reading these books as an adult, maybe even more than I did as a kid.
The Giver (Quartet) by Lois Lowry
The Maze Runner (series) by James Dashner
The Bell Jar, Ariel, etc. by Sylvia Plath
Le Petit Prince (The Little Prince) by Antoine Saint-Exupery
The Call of Cthulhu (short story) by H.P. Lovecraft
Wool (Silo series) by Hugh Howey
Annihilation & Dead Astronauts by Jeff VanderMeer
Alice's Adventures in Wonderland & Through the Looking-Glass by Lewis Carroll
The Promised Neverland - Kaiu Shirai, Posuka Demizu
Dorohedoro - Q Hayashida
Watchmen
Scott Pilgrim
Sabrina the Teenage Witch (Archie comics)
Avatar: The Last Airbender
Invader Zim