These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Doc betrayed Reiís and Zeroís father in battle getting him killed. Then later when their mother refused his advances he tried to rape her and killed her when she fought back. Then ended up taking them both in as his slaves. And after all that once they had him in their mercy he got on his knees and begged for his life. Despite letting him live the moment he came across another vulnerable and powerful child his first thought was what he could do if he had them.
He later attempted to purposely corrupt the darkness in Reiís heart in order to awaken the shinigami. Even Doc couldnít figure out why Rei let him live.
The second time she faced her, Kurohime's utter pwnage of Yashahime. First, she refuses to give on up saving Zero, foiling Yasha's plan to destroy Kurohime in the most emotionally painful way possible. Next, after Hime depowers at the worst possible moment, Yashahime moves in for the kill, only for Yukio and O-yuki to step in and give her a hand. In a parallel of their first fight, Yashahime catches the blade dragon only to notice too late that there were two of them. Cue Oh Crap.
Pretty much anytime a god dies.
Yashahime's actual death. After trying and failing to crush Hime to death with her hand, she finally decides to take the direct approach and pulls her face up from the depths of the planet to simply crush Kandata's ship between her teeth. Having no other logical choice, Hime decides to have the Ultimate Sword live up to its name. She does this by slicing Yashahime aka the planet in half. Yes, Kurohime has now killed the entire world. And it's BEAUTIFUL.
One could argue, Kurohime, if you replace Evil with Jerkass.
Zero after he became the new Death God.
Growing the Beard: The first three or so volumes are fanservice-filled fun, if a bit repetitive. Around volume three, the action picks up as Kurohime starts to resume her battle with the gods; by volume five, she's had, and won, an epic showdown with Dark Ray, and Zero is dead.
Hilarious in Hindsight: Kurohime's adult state is a sexy busty witch with an atitude that uses guns and fights giant creatures, either demons or gods, while doing so with relative ease and style. Sound familiar?
Wangst: Yashahime NEVER stops complaining about Darkray's death despite the circumstances surrounding it and tries to use it as an excuse to kill humanity (along with Kurohime) and try to date the new Death God.