When Delta was born, he was split in half, 1 half is a strict one, and the other half lives in space, who's nice and relaxed. One time Space Delta crashlanded into Earth, and saw a recently revived Maw. After they battled. Strict Delta saw it and ended up yelling at Maw. In annoyance, Maw tried to blast him, but Strict Delta accidentally dodged into Space Delta creating an AWESOME Delta! They battled Maw and won.
On the right is Space Delta On the left is Strict Delta Music: https://www.youtube.com/watch?v=QRjC639IopM&list=PLpXnJosOQVEuetP68xZxROFhyMDKaeLiv&index=13&t=0s
