In most time travel/cloning/alternate reality stories, one character can have multiple copies of themselves running around in the same time period. Some might have problems if those copies meet each other. Then there are these cases... Only One Me Allowed Right Now is a case where the universe either flat out denies multiple copies of a character to exist in a same time period, or that either the character and the copies go crazy or the universe starts to break down, or something bad happens. Examples of Only One Me Allowed Right Now include: