Samuel is an Exceed and the head of Legion in the Fairy Tail franchise.
When Samuel was born, Byro founded him and took care of him. Samuel pays back his obligations to Byro and Legion by supporting his members in their quest for the keys.
Samuel is created by Hiro Mashima as an anime exclusive, minor character in the Fairy Tail franchise. He first appears in Fairy Tail episode 132, Key of the Starry Heavens. He has no information regarding any inspiration used to create him. He is voiced by Yuya Uchida in the Japanese version.
Samuel is a bit conceited when he often tells his enemies that he has predicted their moves based on his calculations.
Like all Exceeds, he has the Aera ability which allows him to fly. He has an unknown ability to predict his enemies.