Unicorn boy. 1
(Book)

"The first few years of Brian Reyes' life were unremarkable--nothing weird about this kid, no sir. Then, one day, a bump appeared on his head, and it grew... and grew... and grew until it was a full-blown, sparkling, singing unicorn horn. That's absolutely the last thing a shy kid like Brian wants, but destiny waits for no unicorn boy. Luckily, Brian has his reassuring pal Avery to keep him grounded as weird occurrences start stacking up, like Brian's breakfast muffin talking to him, or a bizarre black cat offering him a business card. But when shadowy creatures from another realm kidnap Avery, Brian has to embrace his fate to rescue his best friend"--,Provided by publisher.