Mi means who? or whoever. It appears about 420 times. It is the interrogative pronoun for persons. Applied to God, it becomes a declaration of His uniqueness.
'Who is like you, LORD?' (Exodus 15:11) expects the answer 'no one!' God is incomparable. The name Michael means 'Who is like God?' These rhetorical questions are among Scripture's most powerful declarations of divine uniqueness and sovereignty.