I love Yu Yu Hakusho, but upon rereading the manga I notice a lot of things that don't really add up.

First the obvious: I've heard this argued before but the obvious one is Hiei's demon form, despite the fact it makes him more powerful, and he claims to hate humans, he seems like he'd sooned die at times than revert to his demon form, even though he took it fairly quickly when he was a villain. The only thing I can think of is that Hiei wasn't supposed to become one of the heroes, he attacked the main love interest, and was pretty much the text-book villain, but due either to being the creators favorite or a fan favorite I guess it was decided to bring him back. but this adds a few more errors.

later in the series when Yusuke and Kuwabara are worried about Kurama when he's fighting the saint beast, Hiei say's that he only joined Kurama because he didn't want him as an enemy. But when Hiei and Kurama first appear Hiei says his plan was to kill both Kurama and Gouki (spelling?) anyway.

Also, when in any manga has the hero ever forgiven someone who attacked the love interest so quickly?

Lastly, Hiei's character changes drastically from his first appearance. He was loud, arrogant, cruel, and merciless.

After he reappears he is still supposed to have an attitude but he's extremely introverted and quiet most the time. and after his return he gets angry at Seiryu for attacking a comrade, even though (as stated) he intended to kill his own originally. And again he wont do something as dishonorable as attacking Bui while he's on his knee but he had no problem kidnapping a woman, and trying to turn her into a demon?

I guess I'm just picky about this, and I'm glad they bought him back, it just seems like it wasn't originally planned that way.

________________
Favorite Manga:
Yu Yu Hakusho
Mx0
Midori no Hibi
That is all.

Yeah you are correct in prettymuch everything. Though this isn't nearly as bad as the gaping, festering plot hole that involves demons eating humans. This makes NO sense for multiple reasons

- humans are not a naturally occurring creature in the demon world but most (?) demons NEED to eat humans to live. even if demons can go to the human world and eat humans, the demon world is supposedly super vast (as many countries as stars in the sky according to kurama) and I don't see how they can survive this way without wiping out humankind entirely (and then they would just die after that)
- after the last tournament almost all demons stop killing humans and everyone gets along great all the sudden. so...how do the demons sustain themselves now? Hiei even saves humans who fall into the demon world accidentally late in the manga.
- yusuke fights fiercely to protect humans throughout the manga, but when raizen is about to die yusuke offers to go to the human world and bring back some humans for him to eat. WTF

I love the manga and the anime but this is seriously the most gigantic plot hole in the world. In my opinion the story largely goes downhill after sensui dies, mostly because the overall plot from then on has such huge holes. It's also rushed story wise and art wise (you can noticably tell the art gets worse) though I'm aware the mangaka was told to end it. The last few chapters are basically a collection of one shots though the hiei and mukuro one is very good.

its called character development. if the personality or ideas of the character didn't change at least a little bit then the story would be pointless.

Rapid changes in biology that alter your physical dependencies is NOT character development. Tis a plot hole. I still love the series, but yeah there were an f'load of problems that "character development" just wont explain.

Oh and about hiei getting angry at the blue dragon dude. Kurama actually explains that ATM by saying hiei has a very specific and complex code he lives by. It was also stated he has done similar, and worse, things in his past. This isn't really a plot hole. Its just part of hieis oddw personality.


________________
Few favs
Comedy:
Kyou kara ore wa!!, Mx0, Angel Densetsu, Skip Beat, Ai Kora, The Devil King is Bored

Romance:
Hana to Akuma, No bra, Shinigami Trilogy, kindan no koi de ikou, Usagi Drop, Threads of Time, Girl Friends

Most under rated:
Kindan no koi de ikou, kyou kara ore wa!.
m0r l83r... maybe >_>

I believe the answer is obvious. Hiei needs to seem like a merciless badass as a method of intimidation (or to avoid getting close to people?) He's really just a big softy on the inside! Always has been. Polar opposite to Kurama's "speak softly/carry a big stick" approach. I have more of a problem with the inconsistency of demon classes.

________________
Check out my manga podcast:
https://youtube.com/channel/UCr0Us8mMIpX3x0pOud2AUWg

Demons don't need to eat humans, it's just like an addiction. Compare humans to bacon. They taste really good and almost everyone eats them, but they aren't necessary to live.