I think this link is very useful:
the hints are useless on this one . . . but I guessed it because I had written down the list of words from the lessons page . . . shouldn't have to do that to get it right with no previous exposure to the word!
Cause literally it means "I nobody" and doesn't sound correct in Italian nor in English.
Pronouns like 'mi' cannot be used by themselves, they must be attached to a verb. Furthermore, you want the subject pronoun (io) here, not the object pronoun. Think of the Italian as meaning 'nor I' or 'not even I' rather than 'me neither'.