If you're looking for manga similar to The Unparalleled Black & White 2nd Season, you might like these titles.
Onigawara Yuutarou is your average high-school kid, a bit on the quiet, kind-hearted side. One day, he walks through an arcane ritual and ends up summoning a demon, Slayer, who will grant him tree wishes. Horrified by Slayer's violence, Yuutarou wishes for Slayer to stop using his demon powers, turning him into a human. Now Slayer's stuck with Yuutarou in a perfect personality mismatch, and to top things off, if one of them gets hurt, so does the other.
Satan created 72 children immortal and immune to any injury, unless inflicted by a weapon forged in the fires in hell. Each child was given a weapon and told to fight for their survival. The sole winner will become the new king of hell. Hagino Sin, the child despised most by Satan, escaped the netherworld and tricked a kind-hearted writer into taking him home. The plan backfires and Sin becomes attached to the savior and his friends at school. Sin must fight for his survival and kill his siblings before they kill him. Can he survive without losing his newfound humanity?
Ranzou is a big, tough guy with a motorcycle. After a run-in with a not particularly nice man in distress and a giant cat, he becomes a tough guy with a pet spirit cat, a wrecked motorcycle, and no money to fix it. In an effort to make money, he takes a job that lands him in Taiwan, where he and his cat unfortunately find themselves drawn into some serious trouble with demons.
What is it that you desire? Money? Love? Walk again? Be stronger? Whatever it is you wish for, you can get by asking the legendary and awe-inspiring "Demon's Plan"; a sacred object capable of granting anything to "the chosen ones."
"13 years ago, an unknown object appeared at Shinjuku. That creature regularly gives birth to a demon. Therefore, our world is being eaten clean." The military found a weapon capable of fighting these creatures, a special power known as "exex" that becomes part of the human body.