Spike the Dragon is Twilight's no. 1 assistant and foster little brother. He supports Twilight and her journey throughout in almost all of her adventures in Ponyville and beyond. While Spike maybe on the young side, being most likely a pre-teen. He's very smart and responsible than most pre-teens we know today. He maybe goofy and dorky, especially with his one-sided crush on Rarity but he's almost always ready to help Twilight and their friends whenever the moment comes.