𝐅𝐀𝐍𝐅𝐈𝐂 𝐓𝐄𝐑𝐌𝐈𝐍𝐎𝐋𝐆𝐘 [1]

OC

OC = Original Character 

Refers to a non-canon character created by the author that is featured prominently in the story. May be male or female, and either a major or minor character in comparison to the canon characters. May or may not be a Mary-Sue.