"Justin" is the name of a character in the Total Drama canon. Under the rules of this wiki, character page titles for canon characters must include a story identifier (usually the story initials) to distinguish the page from the canon portrayal. For example, if the canon Justin appeared in a story called Reverse Total Drama Island, the character page might be titled "Justin (RTDI)".
Pages for original characters using canon names must also include an identifier to distinguish the original character from the canon character. In this case, the identifier could be "OC" (for "original character") or a reference to the creator's username, or it could be story initials.