In mythology, the creature often depicted with four arms and a blue skin tone is Vishnu, a principal deity in Hinduism. Vishnu is the preserver and protector of the universe, embodying mercy and goodness. His multiple arms symbolize the ability to perform several tasks simultaneously, representing his divine influence over creation and maintaining order in the world. Various avatars of Vishnu, like Krishna and Rama, further illustrate his role in guiding humanity through moral dilemmas.