He would probably like Junie B too. I know most consider them girls books but they are hilarious and both my kids (boy and girl) loved them in 1st grade.

Anonymous wrote:My Weird School series. My son's first grade teacher got him hooked on reading with it.

I also recommend this! It is so hard to get my 1st grader to read but he loves these book to the point where he come to tell me every funny thing he reads.