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.
It is easy to give Kasumi this treatment as well considering her Dark and Troubled Past, but one must not forget that her reasons may or may not justify her actions. And there are still some who might forget that she's not the nicest person in the world.
Ear Worm: Shurenís incantation: Fire burn and fire roar, total destruction from mountain to shore. Does not help that it sounds very similar to the line Gargamel spouts in the opening sequence.
Foe Yay: Between Mari and Treva, though itís lessened by the fact that Mari is a lesbian.
Quite a bit between Aizen and Lelouch, at least from Aizen's side of things considering how at the end of the Aizen's Revenge arc Lelouch just walked away with a case of Screw This, I'm Outta Here! and not even bothering to debate with Aizen.
Rita and Kasumi.
Fridge Brilliance: All of the matchups in the second battle of Karakura Town, which were set up by Lelouch are a case of this when the method to his madness is revealed.
The name of the first Soul Reaper in existence is Feluca Tetelra Sharaimyn. In the omake of ch 134 the Soul Kingís true form is Fluttershy. Look at the name long enough, youíll notice the meaning and that this makes Feluca and the Soul King one in the same. This then begs the question: how did Feluca become a pony?
Unohana letting down her braid, being an absolute terror on the battlefield and her Dark and Troubled Past are a downplayed version of this given canon.
Kenpachi learning the name of his Zanpakuto, which has finally happened in canon.
Isshin being captain of the tenth division and being a member of the Shiba clan
Ho Yay: Byakuya can be very dedicated to Lelouch. However, Word of God says that this will never be canon.
Talbumosuke, likewise, can be extremely loyal to Aizen.
Byakuya has finally gotten over his hero worship, although he still holds extreme respect for Lelouch.
Tatsuki mentions that if Keigo was a different kind of guy...
Tensa Zangetsuís Undying Loyalty to Ichigo comes across as this if you read too much into it.
The same can now be extended to the two arcs that comprised of R1 and R2 of Code Geass since the whole point of them is to show what's in the background. There were several scenes that are noticable to give the reader a hint as to where in the series the scenes are taking place, but ultimately nothing that you can't just go to the anime and watch is used unless it can be, in the author's own words, changed or modified to add new information.
There is a whole laundry list of scenes people wanted to see that the author skipped over because he felt he couldn't add anything to the scene.
Just Here for Godzilla: Several fans are harping on the point in the story where Lelouch will go to the World of Living during Code Geass canon some of which, upon inquiry even admitted they would stop reading if the author aborted that arc.
Les Yay: Cornelia and Nonette tend to come across as more than friends very often. Even when she was a teenager, Nonette would make flirtatious comments.
Kallen and Inoue have this Big sister/Little sister going on between them that has led to fans seeing them as more than just friends.
Moral Event Horizon: Tsukishima crossed it for every YoruSoi fan when he Made Soifon completely forget about Yoruichi
Guinevere su Britannia crossed it by setting up a trap to have Cornelia to become a War Criminal with a mission that caused her to unintentionally kill innocent Britannian civilians knowing well of her mental condition.
Kasumi may have crossed for some when she killed her own child despite her mental state at the time.
Lelouch nearly crosses this for the members of the Soul Society, but Kendra stands up for him.
Possession Sue: One could argue a case of this for Captainof Squad 10LelouchLamperouge; the author has denied this. While not a complete Sue, he does have moments of Sue-dom, particularly as a product of 'Sue-by-association' with Aizen and Lelouch's constant desire to one-up him.
Rescued from the Scrappy Heap: A few fans that didn't particularly like Rita did a complete 180 when she eradicated the Soul King and let Feluca become the Soul Queen.
What an Idiot: Lelouch's propencity for gloating can get him into trouble, just like in his previous life.
It's actually worse than his previous life because it makes him look sadistic.
Kaien attacks Ichigo on Aizens advice. He knows that Aizen is the Big Bad, and he still listens to him.
Subverted when Lelouch fights Aizen head on, by himself. It was all part of his plan.
Shawlong. He monologues and passes vital information to Uryu.
Did Needles really think he was going to get away with attempting to rape Orihime or convince Ichigo to join in on the action. And then trying to spinelessly back out of it? The man is lucky Ichigo left him breathing.
Talbumosuke sending Gantebainne into town to test Segunda Etapa, and getting curb-stomped by Yoruichi; all it did was tip off Lelouch as to one of his best trump cards. Surely a supervised intra Espada battle would have been more productive; while it's explained in story that Tally didn't want to risk damaging his Espada in such an exercise, Ganty's abject performance sort of belies his argument.
In the same vein, Tally had less of a numerical disadvantage in the first battle (2-to-1 vs 3-to-1), yet played completely into Lelouch's hands by sacraficing his mooks basically for nothing in the first.
Kasumi not keeping a closer eye on Aizen; she knew he couldn't be trusted, yet did nothing to stop him from pulling a fast one and taking the power himself.
If Aizen's such a hassle, why not just forcibly reincarnate him? End of problem; could even considered a Fate Worse than Death to someone like Aizen.
Surely the idea was for everyone to fight Aizen together for the final battle; he did Ichigo the service of waiting for everyone else after him to show up. Kenpachi, being a Blood Knight, you can understand, but why did Stefan, Yhwach and Kensei, who have a bit more sense, try to fight him before the rest arrived?