In each reign of Manu, six types of personalities appear as manifestations of Lord Hari: the ruling Manu, the chief demigods, the sons of Manu, Indra, the great sages and the partial incarnations of the Supreme Personality of Godhead.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मन्वन्तरं मनुर्देवा मनुपुत्राः सुरेश्वराः । ऋषयोंऽशावताराश्च हरेः षड्विधमुच्यते
manvantaraṃ manurdevā manuputrāḥ sureśvarāḥ | ṛṣayoṃ'śāvatārāśca hareḥ ṣaḍvidhamucyate
SB 12.7.15