An Alien Mercinary in Hell (Helluva Boss Harem x Male Omnitrix User)

Y/n L/n was a normal punk teenager who likes beating up scums and get paid. But after he met an alien who created a dangerous weapon in the universe to make everyone play by his own rules gives the human the power to transform into alien creatures and encountered some demons who are assassins from hell. The teenager becomes not only anti hero but someone who wouldn't want to mess with.