The Andalite Chronicles
His name is Elfangor-Sirinial-Shamtul.
An Andalite war-prince. The one who gave five young humans the ability to morph into any animal they touch. They are still out there, fighting an evil so powerful there isn't a moment that goes by when they can actually feel safe. Their story continues. 
But *this* is how it all began.
Fantasy, Juvenile fiction, Metamorphosis, Science fiction, Princes
Katherine Applegate
Katherine Alice Applegate is an American writer, best known as the author of the Animorphs, Remnants, Everworld and other book series. She won the 2013 Newbery Medal for her children's novel The One and Only Ivan. Applegate's most popular books are science fiction, fantasy, and adventure novels. She won the Best New Children's Book Series Award in 1997 in Publishers Weekly. Her book Home of the Brave has won two awards. - [wikipedia](https://en.wikipedia.org/wiki/Katherine_Applegate)