Devon Blaine Marks is the main protagonist of The New Kid, the third story in Fazbear Frights 3: 1:35 A.M.. Depending on how one interprets the story, he could also be considered the main antagonist.
You can add as many animals as you like in as many breeds as you like. The only rule is do NOT be weird about "spirit animals;" see here for more info: https://www.wellandgood.com/spirit-animal-native-american/
