Lol, dark complexion wasn't considered desirable in the Rigvedic era.Vishvamitra invokes the destruction of dark-complexioned Anarya-s.Major brahmin clans such as Vashistha-s, Bhrigu-s are described as fair-complexioned or resembling the colour of Surya and Agni in the Rigveda+
Vedic Rishi Kanva had dark complexion.
Infact dark complexion was desired in ancient India.
Here's Rigveda guiding what to do to get dark complexionied son who will master Vedas.
Manu Brahmins have dark complexion.