Phra Lak is the third son of Thao Thotsarot and the half-brother of Phra Ram. He is the incarnation of the serpent Naga from the throne of God Phra Narai. Also possessing special powers, he is crucial in assisting his brother the King in their fight against Thotsakan to rescue Nang Sida. During the process, he was involved in many battles but was never defeated. He is characterised by his intricate golden costume, and wears a gold towering crown. He carries a bow with arrows as well as a dagger as his weapon.