The Lost Soul With The Omnitrix (Ben 10 x male Omnitrix user)

Y/n L/n was normal kid, lost and alone. He lost his mother who passed away from illness and his Dad didn't care and threw himself to work, neglecting his son and later abandoned him for science. But one night, the boy finds a mysterious device that lets him transform into different alien creatures and taken in by the smartest being in 3 but possibly 5 galaxies and the creator as his mentor of becoming a hero to bring peace and unite other beings.