Backstory: Carlos is the youngest child of Cruella De Vil, with an older sister by the name of Dominique (oc), a designer of perfume who actually perfected her trade on The Isle of Lost Souls, before the curse cast by The Evil Queen drug her to Storybrooke, Maine. Carlos of course was among the first four, the main VKs to go to Auradon. It's here that he meets many friends, including his closest pal Dude, his furry companion, despite all the horrible things that his mother had told him about dogs. Carlos was always one of the better mannered, and the kinder of the VK's so being a 'good kid' came pretty easily for him.
Despite being naive he's also pretty brainy, and helps his friends with many a tasks. It is because of his intellect that following Mal's disappearance he is able to deduce that she has in fact been drug to another world, after discovering that many of the villains have gone missing as well, including, but not limited to Hades, The Evil Queen, Jafar (who is now deceased though unknown to Auradon), Maleficent (also dead, though again not known to Auradon) and Faciliar. Though while he has gotten braver in the past couple of years, he's not entirely sure he's ready to go on a rescue mission of this magnitude, not knowing where all the baddies in fact are, or just how many others might be among them.
Facts: Dude will become an automatic NPC played by whoever takes this role, and yes... He is still able to talk.