* ArcFatigue: Kenichi's development has gotten this reaction as of late with many claiming that his growth has stagnated ever since his rematch against Tirawit which occurred about 150 chapters prior to the most recent chapter.
* AssPull: Shigure Kosaka's ultimate technique: Soutou Kyourenzan, which is telekinesis limited to weaponry. Even in a setting like this, such a technique is off the wall.
** [[spoiler: The reveal that the First Fist of Yomi and the murderer of Miu's mother was not Saiga but infact an imposter pretending to be Saiga. Fan reaction has been quite split.]]
* AwesomeMusic: [[http://www.youtube.com/watch?v=519T50rG7fQ Kenichi's theme.]]
** At least in the dub, ''Night on Bald Mountain'' plays almost every time Siegfried shows up.
** The openings "Be Strong," and "Yahoo!" Are pretty awesome too.
* BaseBreaker:
** Miu, many fans were not happy with the reveal that after the [[spoiler: Miu rescue arc, Miu was once again a much stronger fighter than Kenichi.]] This then led to arguments about when Kenichi should become better than Miu or if he should at all. She's also the poster-girl for the amount of backlash this manga receives for its "unnecessary" fan-service as described in BrokenBase.
** The rest of the Ryonzapaku Dojo (and the evil masters, as well). Either they are extremely CrazyAwesome (even the ones that could be labeled as [[CompleteMonster Complete Monsters]]) or they are [[MarySue so obscenely]] [[MartyStu overpowered]] [[HowToStopTheDeusExMachina that the author has to set absurd contrivances and unwritten rules]] in order to keep anybody (from the disciples to ''the friggin world governments'') useful.
* BigLippedAlligatorMoment: [[http://www.mangareader.net/historys-strongest-disciple-kenichi/299/4 Who else but Siegfried?]]
* BrokenBase:
** The fan-service. You either find it enjoyable to a certain degree, or it's an unnecessary distraction to those who are reading for the fights and storytelling. And it just gets ''much'' more blatant, and in-your-face, as the series goes on; further alienating the detractors. The worst of it being the [[http://www.mangahere.com/manga/historys_strongest_disciple_kenichi/v45/c520/6.html many]] [[http://www.mangahere.com/manga/historys_strongest_disciple_kenichi/v45/c521/17.html weird]]- [[http://www.mangahere.com/manga/historys_strongest_disciple_kenichi/v45/c523/4.html angle]] [[http://www.mangahere.com/manga/historys_strongest_disciple_kenichi/v45/c524/ shots]] of a helpless Miu seen throughout the Amusement Park arc during what is ''supposed'' to be an intense fight between Ogata and Tanaka.
** Master-class. The moment you see that [[TheAlcatraz the specially-designed super-prison meant to hold the captured bad guys]] [[MightAsWellNotBeInPrisonAtAll only holds them because they]] ''[[MightAsWellNotBeInPrisonAtAll want to stay there]]'', you just understand that there is no way [[{{Muggles}} "normal" people]] have a chance in hell of winning against them... [[InnocentlyInsensitive which makes]] [[CondescendingCompassion their casual]] [[ArrogantKungFuGuy condescending attitude to (or rude dismissal of, for the villains) everybody who isn't a fellow Master or their disciples]] very, ''very'' infuriating. Of course, you may have felt that earlier with Master Furinji [[CurbStompBattle curb-stomping an entire U.S. Army base as a distraction]]. On the other hand, they are a constant source of CrazyAwesome battles and martial arts feats.
** The ending as to, whether or not, it was too abrupt of a closure. The fact Yami still has several prominent members at large doesn't help either.
* CargoShip - Kii Kagerou x Setsunamaru (his sword). Completely canon; when he is forced to use another, he apologizes aloud for cheating on her. He also frequently calls her "beloved". It's even reciprocated.
** Siegfried's first love was a violin.
* CompleteMonster - YAMI master Silcardo Jenazad couldn't stand lasting peace, so he incited a civil war, which he's still actively maintaining, in his own country 20 years ago. During said ongoing civil war, one of Jenazad's servants informs him that the men, who joined his side, because they were devoted to his cause, will die in large numbers if they persist in the current segment of the conflict. Jenazad's response: "So?" For his research purposes Jenazad causes his past students to fight and kill each other. He causes an avalanche to kill his own modern-day YOMI student, [[AssholeVictim who, granted, isn't a very nice guy himself to begin with]][[spoiler:[[NotQuiteDead (except he survives)]]]]. Jenazad also almost manages to trick [[EvenEvilHasStandards fellow YAMI member Akira Hongo]] into [[spoiler:[[MoralEventHorizon killing the titular protagonist]]]] as well as kidnaps and brainwashes [[spoiler:Furinji Miu]] into becoming his newest cold-blooded disciple. He later supervises [[spoiler: the [[BrainwashedAndCrazy brainwashed]] Miu's battle against Kenichi, with the expressed purpose of getting her to kill Kenichi, following which her mental state will be completely subject to Jenazad's manipulation and the brainwashing process to convert her into his thinking will be complete]]. Jenazad detests peace so much he is willing to kill his country's deposed princess (the sister of the aforementioned 'dead' YOMI disciple), who is all for restoring peace to the nation. Silcardo Jenazad winds up being [[spoiler:the only Nine Fist member to get {{killed off for real}} - by a fellow Nine Fist, the aforementioned Akira Hongo, no less]].
* CrazyAwesome - All of the masters are crazy and awesome to various degrees. Siegfried, the guy who spins around like a top and sings while pounding his opponents into dust also deserves a mention.
** [[SexyMentor Shigure]] gets a crowning moment of CrazyAwesome in chapter 285. She and Kenichi are ambushed by three skilled assassins after Shigure's head. She takes out all three of them (two of them with her ''hair ribbon'') and left all three alive. Awesome enough. What puts this in CrazyAwesome territory is that she does all this ''while completely naked''. Also randomly decides to terrify waitresses with shurikens and thrashes delinquents with spoons.
** In 363 Ma Kensei just took down four female members of Yami's weapon division by ClothingDamage. Yes, ClothingDamage. He's just that good.
*** Shades of [[MahouSenseiNegima Jack Rakan]], anybody?
** How could we forget "Laughing Fist" Diego? He's that focused on entertaining the audience, that [[spoiler:even after getting hit and defeated by Ma Kensei's ultimate attack, [[http://www.mangafox.com/manga/history_s_strongest_disciple_kenichi/v36/c333/14.html he first moves into the perfect camera angle to fall down]].]]
** Over the course of their two battles, Akisame Kotetsuji and Alexander Gaidar attack one another with sculptures made from steel rebar, carve statues out of rubble and generally turn whatever place they're fighting in into an art museum.
** Siegfried also counts.
* EnsembleDarkhorse: Renka, despite not appearing very much till about chapter 310, is incredibly popular.
* FetishFuel: [[http://www.mangafox.com/manga/history_s_strongest_disciple_kenichi/v41/c386/15.html Shigure, naked but for very revealing chainmail and a thong fundoshi, on the back of a Harley...]]
** Maybe 1 in 8 to 10 title pages for each chapter, really.
* FoeYay: Some people claim this is the case between Sakaki and his {{Rival}} the God Fist. After seeing [[http://www.mangareader.net/historys-strongest-disciple-kenichi/435/8 this page]], they may be on to something. Although they were just kicking the two people behind the other.
** Both of Renka's fights against Rachel. In the amusement park, they end up wrestling each other stark naked. Also, Rachel didn't strip them for attention, since there was no one there.
* HoYay: Has its [[HoYay/KenichiTheMightiestDisciple own page]].
* MagnificentBastard - Niijima, though he becomes less of a bastard over time (but not enough to no longer qualify for this trope).
* MemeticMutation - "This is Diego Quality!!!"
* NightmareFuel: The end of Chapter 524. [[spoiler: Ogata '''crushes Tanaka's head''' with an '''elbow strike'''.]]
* ShipsThatPassInTheNight - Some people seem to have gotten the idea that it's actually possible for [[ClingyJealousGirl Renka]] [[RomanticRunnerUp to end up with]] Tanimoto or Takeda. This is more of a PairTheSpares kinda thing due to it being blatently obvious that Kenichi is Miu-sexual.
* TheyWastedAPerfectlyGoodCharacter: The entire Hachiou Executioner Blade team. They were built up as equals to the the top Yami masters, but are treated as little more than an ineffective QuirkyMinibossSquad. They have their own band of weapon-wielding disciples in Yomi for the Shinpaku Alliance to fight, only two even have names so far, but aren't as wasted in comparison because they ARE just a QuirkyMiniBossSquad, and [[spoiler:are close to overwhelming the Shinpaku Alliance. Time will tell how effective they remain after Yomi-Unarmed's collective HeelFaceTurn.]]
** And with the manga having ended, any expectations for further development for the squad (as well as any other characters) is gone.
* TooDumbToLive: Kenichi's refusal to [[WouldntHitAGirl fight women]] is depicted as chivalrous (especially by Miu) but in reality just gets him beat half to death by [[BerserkButton enraged]] female characters (e.g. Kisara) that he refuses to defend himself against. This is especially frustrating when coupled with Miu's god-like martial arts skills - every single time he is shown sparring against her or Renka, it always ends the exact same way.