Vishnu

Known as the preserver, Vishnu is one of three supreme Hindu deities, along with Brahma and Shiva. His presence is found in every object and force in creation, and some Hindus recognise him as the divine being from which all things come. 

Vishnu is known for his steadfast principles of order, righteousness, and truth. When these values are under threat, Vishnu emerges out of his transcendence to restore peace and order on earth.

The legends is that Lord Krishna drank poisoned milk given by a demon when he was a baby and that caused the bluish tinge in his skin.