Danny Dunn (Danny, Irene, and Joe have scientific adventures)
The Three Investigators (Jupiter, Pete, and Bob solve mysteries)
Henry Reed (Henry and Midge are too smart for their own good, and wreak havoc)
A bunch of dead dog books, why did you have to remind me??
A bunch of dead teenager books, why did you have to remind me??
Trixie Belden. (Another girl detective.)
Bobbsey Twins. (Very old-fashioned!)
Tom Swift. (The really old ones, or the vaguely updated ones? The newer ones have kick-ass women.)
Sam Pig, Tim Rabbit, or other Alison Uttley books.
Cherry Ames. (Mystery-solving, red-cheeked nurse.)
The Black Stallion series.
Sweet Valley High.
Other books or series. (Describe!)