Nebula Gray

Nebula Gray is a dark, monstrous program made entirely of Dark Power, created by Dr. Regal. It is the cornerstone of his research on the darkness within the human's soul.

Having not only the power to amplify negative emotions but also to give them tangible form, it serves as the very core source of the creation of Dark Chips and instrumental in Regal's plan to fill the world with pure evil.

(Source: Mega Man Knowledge Base)