Danny

Danny is the main protagonist of Diary of a Neapolitan Mastiff and the books are told from his point of view in his diaries.

Personality
Danny is depicted as relaxed, caring and a more introverted individual in the book series, though still has his friends such as William, and the rest of the royal guards. This differs slightly to his depiction in the TV show, where he is cheerful, lively, and a little slow in the head. He appears a little stubborn at the start of the book series, but by the end is a more accepting individual, and enjoys documenting his life in his diaries, and thanks William for giving him this opportunity.

Book series
Danny is a Royal Guard, and meets Kate when she accidentally comes to Pocket Kingdom. Danny appears to have some struggles, as he has disputes with William, with the latter even kicking him from "Pocket Kingdom Laws". Things are made worse when he becomes the center of attention after a prank, and to top it off, is kidnapped by the Petbuster during christmas. He is eventually taken back to Pocket Kingdom and helps Kate and Magic train to defeat the Petbuster, which they do successfully. Danny ends his dispute with William and become friends again, and the prank is forgotten about.

Three years later things look up, until the events of V, where Ava struggles to find the chosen dog in the pocket-pedia to be sent away to Earth. Matters are made worse when the Petbuster teleports to Pocketville to attempt to catch Ava, but accidentally kills her. Danny teams up with William, Magic, Pally and Wallis to take down the petbuster, and return him to Pocketville. The friendship these five showed during their journey ignites the magic from their hearts to resurrect Ava, who in-turn kills the Petbuster and unleashes the magic across the Kingdom, allowing all residents of the land to become more open-minded, accepting, friendly and polite.

Diaries
Danny has written in eight diaries, resulting in the eight books in the series. His first diary was given to him by William, and uses it to document how Ava and Kate switched places. William gets him another diary when his first is finished, and documents how William is getting annoying. William gives him a third diary after this. Danny constructs his fourth diary by using correcton fluid on scrap paper and sticking it together with glue. After this, Danny continues his journaling by his own initiative in the Sequel Quadrilogy, and ends up enjoying it and making it a personal hobby.