Donnie Santini is one of many characters Habbo have created to be used as part of a quest. He was a part of the Steampunk Campaign.
During the campaign, he would be on a quest which he would end up getting lost. He then, out of panic, would sent out a S.O.S via Minimail.
There were badges to be won during this campaign which would be achieved after completing a task and finding him on one of his adventures. As well with this campaign, the Steampunk Furni line was released to help Donnie by building a steam machine for him.