He [Hazrat Mahdi (as)] will follow in the steps of our Prophet (saas). He will have an angel, unseen by him, that helps him. He will restore the weary and help the weak.
(Sheik Muhyiddin Arabi, Al Futuhat Al Makiyya, Section 366)
Hazrat Mahdi (as) will act completely in line with the Sunna of our Prophet (saas). Mikhail, Jibril and other angels will help Hazrat Mahdi (as). The hadith notes that Hazrat Mahdi (as) will be unaware of the angel that assists him. Anyone looking with a sincere eye will feel the Allah’s assistance is upon Hazrat Mahdi (as), but they will not encounter any phenomenon that removes all doubt. Only the world of the angels will be aware of this angel. The hadith also refers to Hazrat Mahdi (as) generally restoring the weary and encouraging their enthusiasm, and to his helping the weak.