This is Camembert Bordeaux, the accidental son of Rarity and Cheese Sandwich. Conceived during the wild and drunken wedding reception of Pinkie pie and Cheese Sandwich, Camembert was raised by Rarity and is bitter towards the world due to the circumstances of his birth and the lack of a nuclear loving family.
 
Even though Rarity loves him dearly and Cheese Sandwich loves to visit and spend time with his son, it’s clear that his parents aren’t in love and secretly only see him as a mistake, or so Camembert has convinced himself. He dislikes his half siblings ( Cheese and Pinkie’s daughter and Pinkie and Big Mac’s son) and everyone else who has a happy loving family mostly out of jealousy.
 
He is a connoisseur of various cheeses and wines and finds it diffuse to make friends, but when he does, he spoils them rotten and is undyingly loyal.