Sangye refers to one who has awaken (sang) from the deep sleep of ignorance and whose mind has blossomed (gye) like a lotus flower to the knowledge of all things. Through one's remaining in nondual awareness, the qualities of enlightenment are revealed, although in reality there is nothing to adopt and nothing to purify in the true nature of mind. As Accomplished of Wisdom says:
Clear luminous mind itself
Is the essence of the three mandalas
Having understood this, pay single minded attention,
And the supreme fruition will be attained
Shakyamuni Buddha is a fully awakened, fully evolved being and a perfect teacher of enlightenment to humans and gods. His or her perfect wisdom experiences the exact nature of reality and perfect compassion embodies the will to others' happiness. A buddha is both human and divine, adamantine embodiments of ultimate freedom inconceivably present as all forms of love and goodness within relative reality.
A buddha is not a Creator. Evil is comprised of the bad habits of oneself and others, rooted in misconception of reality, and misunderstanding of the self as the absolute, self-sufficient, and ultimately separated from others. Such conceptions only leads us towards greed and hate. They ultimately cause negative evolutionary actions, such as stealing and killing, which are real cause of sufferings. Evil is just suffering and good is just happiness. The purpose of life is to get rid of all suffering and find real happiness.
A buddha has three bodies which is the body of Truth, Beatitude, and Emanation. The truth body (Dharmakaya) is reality worn as a body, absolute fulfillment. The beatific body (Sambhogkaya) is the bliss of that fulfillment. Emanation bodies (Nirmanakaya) emerge from that union of wisdom and bliss to enfold suffering beings into a field of happiness. The emanation body is the living Buddha art, which are inspired by the buddhas' loving will to lift beings out of their routines and to help them in their own fulfillment.