Ability: resurrecting the death as zombies to to convey their last messages (and revenge). After the first arc, it becomes a bit like jojo stand power: people with the satanic star marking can summon their own special zombies from hell to fight for them. People with special marking like the main girl reiko have extra ability. reiko can resurrect the corpses. Most boss characters (main villian) also have their own special power. Later in the manga, there are more gimmics, basically about zombie and magic. Not all villain has stand power (might not even be aware of it). That makes things interesting.
Structure of the manga: it consists of episodic chapters and a few long arcs. Some arcs are much longer than the others. Each arc has a main villian. Some of them have many strong underlings. Some arcs have a mix of more independent villains.
Characters: Characters who survive the arc would join the gang. Killed villain boss characters might come back as powerful stand zombies. There is a recurring boss. And yes, she eventually redeems herself. And yes, more females than males.
Warning: lots of gore. Lots of boobs with nipples actually drawn. And very cruel. It doesn’t even spare kids. If you are uncomfortable about depiction of kids getting beheaded, skip this one! Ally characters can also have very cruel deaths.
Art: it evolves. By the end of the series, it becomes a lot like the author’s later works (bulk women with thick strong arms)
Spoiler
On the top of my head:
Arc1: serial little-girl killer (comes back as a knife-wielding stand)
Arc2: the queen (reiko’s evil twin sister) (introducing ally characters)
Arc3: sister of the serial little-girl killer (come back as boxing stand)
Arc4: return of the queen, star-absorbing man, bullets that turns people into monster, bad military with cruel female commando captain (also more ally character)
Arc5: star-giving man with deadpool-like healing (add ally)
Arc6: the op ancient evil witch who possesses anyone who looks at and touches her soul stone jewelry. (Add ally)
