All of these books are for the littlest of readers, and they help make monsters (so real to some little kids) less scary. Funny even.
Maggie and the Monster by Elizabeth Winthrop
Follow Maggie as she tries to figure out what to do with the monster in her closet.
A World Full of Monsters by Troy McQueen
Back in the old days, monsters used to be all over the place, did you know that?
And here is a plethora of monsters by Mercer Mayer:
There's a Nightmare in my Closet, There's Something in my Attic, There's an Alligator Under my Bed, Monsters are Everywhere. Every one of these is hilarious and helps monsters seem less scary. I have these books in a monster collection, but I can't find it on Amazon anymore.
And one more...
Even Monsters Need Haircuts by Matthew McElligot
How do monsters get haircuts anyway? And what kid wouldn't want to be their barber?