I don’t know if this has been discussed before. But a man called Ahmad al-Hassan from Basra (Iraq) is claiming to be a "messenger" of Imam Mahdi (عجّل الله تعالى فرجه الشريف).
This is what I know so far:
-His name is Ahmad al-Hassan. His followers call him Imam Ahmad al-Hassan al-Yemeni.
-He is from Basra, Iraq.
-He is middle aged.
-No photos available.
-They put (عليه السلام) in front of his name.
-His followers think he is