As the title states, this will be covering the flaws of characters that state they are Nonexistent in roleplay.
First off, if a person claims they are nonexsistant, then obviously they do not exist, that is pretty logical right?
A person that does not exist cannot be affected by anything that does exist, but they also cannot affect anything that exists. In order to affect something that exists, they must exist in some way or another, thus countering the statement that they don't.
It does not matter what kind of abilities a roleplayer states they have, if their character is nonexsistant, their abilities do not exsist either and cannot affect anyone or anything in existence. So basically a nonexsistant character must be wrote off as useless and futile.