The monkey met The Pack in Curse Of Strahd, fiercely looking to defend Blinsky from Jarmo Maulgrave. He did so by flinging his own excrement. Later on, he was left in Blinsky Toys during the Riots Of The Blazing Sun, but was unknowingly saved from the fires by Shakti of the Wildhunt.
Piccolo was a tutu-wearing Capuchin Monkey, raised in captivity in Wistimere's Marvelous Menagerie. Bought alongside Shredder, he became the temporary companion of Rudolph van Richten in Cliffsunder, acting as a sort of prop to make van Richten pass as a Bard. While traveling with his master, Piccolo was also transported through the mists to Barovia. There, he was given to Gadof Blinsky, both for Piccolo's safety as well as out of pity for the depressed toymaker.
The monkey was a very ill-tempered chimp, as prone to throwing excrement and howling as he was to performing parlor tricks.