[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/That_One_Loli_7595.jpg]]
[[caption-width-right:300:[[GreenEyedMonster Is Parsee jealous]] of all the higher level bosses on this page? [[TemptingFate Well, there's no way a stage 2 boss could ever--]] [[WrittenSoundEffect *pichuun*]]]]
-> ''"Still, is it too easy? Well, [[BlatantLies I'm about at my limit]]..."''
-->--'''ZUN''' on ''Perfect Cherry Blossom'', the only ''Touhou'' game to have a phantasm stage - a level ''above'' the usual [[BrutalBonusLevel extra stage]].

-> ''"I can see it... My mind-reading third eye will show me your very heart! An image of battle... I think I can use this to make you suffer. [...] Now, this is where it really begins! Go and sleep with a trauma so frightful it will wake you up!"''
-->--'''Satori Komeiji''', ''Subterranean Animism'', stage 4.

As anyone who has played ''VideoGame/{{Touhou}}'' will tell you, the boss fights [[BossGame are what these games are all about]]. There are [[LoadsAndLoadsOfCharacters well over 100 boss characters]] in the series, and you encounter most of them only once, so it's natural that some make a more lasting impression than others. In {{fanon}}, they might be famous for their colorful personalities, ridiculous cuteness levels, or MemeticSexGod/[[MemeticMolester Molester]] status, but for those who have actually played the games, they will always be [[SarcasmMode fondly remembered]] for a different reason.

[[ImprobablyFemaleCast She]] may not be the hardest boss in her game. She may not test your skills to the same extent as the FinalBoss, or your [[MarathonBoss patience]] and [[{{Determinator}} determination]] like the [[BonusBoss Extra Boss]]. Beating her may not even earn you much bragging rights. But [[WakeUpCallBoss she will make your life a living]] BulletHell [[WakeUpCallBoss nonetheless]]. She is the reason many people have never seen the good endings. She has left countless broken hearts and keyboards in her wake. Even hardened shmup players have been known to reach for the [[SmartBomb bomb key]] at first sight of her. She is [[ThatOneBoss That One Girl]]!

''Which'' boss exactly qualifies for the title varies from player to player and depends somewhat on your choice of character and shot type, but generally every game has at least one boss that will make you go [[{{Memes/Touhou}} pichuun]] again and again long after you've figured her patterns out. You can always count on them to mess up your until-that-point perfect game. They are mostly found around [[DifficultySpike stage 4 or 5]].

'''NOTE:''' As always, the FinalBoss and WakeUpCallBoss cannot be ThatOneBoss without being overly hard by ''their'' standards. Please do not add them as examples. Also, to avoid cheapening the title, don't list bosses that are only an example on [[HarderThanHard Lunatic difficulty]] or because of [[ThatOneAttack that one spell card]] you can cancel out with a single bomb. Remember BonusBoss is completely banned no matter what. This includes Extra stage mid-bosses too.
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[[foldercontrol]]

[[folder: ''The Story of Eastern Wonderland'' ]]

* Marisa Kirisame in her very first appearance [[http://youtu.be/9qPgVAX5caI?t=4m8s as the stage 4 boss]]. She pulls out four multicolored orbs that all shoot danmaku in addition to the bullets coming from herself. Furthermore, she can cause them to spin around outward in a fashion that is very hard to anticipate and dodge. She becomes much easier when the orbs are destroyed... until she simply recreates them. She is also aggravating due to her tendency to fly down to the bottom of the screen, much closer to the player than most other ''Touhou'' bosses, which makes dodging her attacks harder or impossible.

[[/folder]]

[[folder: ''Lotus Land Story'' ]]

* Elly, [[http://youtu.be/iFS4Wwmdbxc mainly because of her scythe]]. She throws it at you in the middle of her patterns, which already require a fair bit of precision, it's slightly homing, and ''it blocks your shots''. If you're playing a shot type that can't get around that it'll be a very long fight.
* When playing as Marisa, there's [[http://www.youtube.com/watch?v=SW7MHfN7Lmw Reimu in stage 4.]] She is a ''nightmare'' to defeat, since she has several attacks that can either spawn very fast spreads of bullets, yin-yangs which are large and bounce off the sides of the play field in erratic fashions, or wall in the player and force them to dodge fast aimed bullets.

[[/folder]]

[[folder: ''Mystic Square'' ]]

* [[DualBoss Mai and Yuki]], the stage 4 bosses, are pretty frustrating due to the sheer amount of bullet spam coming from two different directions, as well as Mai's laser and small bullets. And that's when you fight them together. Depending upon who received the most damage, you fight the survivor, and it gets ''harder''. Mai uses bouncing ice daggers and egg bullets that break into ''more'' bullets when your shots hit them. Yuki, on the other hand, just spams slow and fast patterns, but also uses fireballs that block shots.
* [[NinjaMaid Yumeko]], the penultimate boss of the game, is known for being a nightmare to defeat even for experts. While the difficulty of the game is gradually but steadily raised until her battle, she herself is a nasty [[DifficultySpike difficulty spike]]. Half of her patterns require very fast reactions - she just throws some knives and bullets. But later, you have to deal with VERY tightly aimed streams of bullets/lasers AND knives she randomly throws everywhere. If you survive that, prepare for some very fast bullet walls followed by more knives... from both sides of the screen! Her final attack, which "only" requires dodging diagonally thrown daggers, seems easy by comparison. And since all of her patterns are speedy and need very good reflexes rather than good bullet trajectory reading, you will usually have to bomb in advance to avoid losing even more resources. [[http://www.youtube.com/watch?v=9je7BlVaSds Just watch this video...]]

[[/folder]]

[[folder: ''Embodiment of Scarlet Devil'' ]]

* Patchouli Knowledge, the stage 4 boss, is the novice VideoGame/{{Touhou}} player's greatest obstacle to completing the game without continues. Her spell card patterns are very random, and she tends to move around a lot, making her a challenge to hit. If you chose to play as Reimu B, who is otherwise the most balanced character, [[http://www.youtube.com/watch?v=3t51eBKKhiE you're stuck with torturous spell cards like "Bury in Lake" and "Water Elf".]]
* If you got past Patchouli, there is no chance to rest, as Sakuya comes very soon after. Her midboss pattern is specifically designed to box the player in. It does not help that she is the first user of [[ThatOneAttack that annoying dagger danmaku with a hitbox which seems larger than the actual sprite]]. Her stage 5 midboss spell card "Misdirection" can drop your lives quickly if you don't know exactly how to deal with it.
* Right BEFORE Patchouli, we also have Meiling, but her battle might be more of That One Spellcard than anything else, because of that accursed Rainbow Windchime spell.

[[/folder]]

[[folder: ''Perfect Cherry Blossom'' ]]

* The Prismriver Sisters, come at the end of stage 4, which is already [[ThatOneLevel arguably the hardest non-extra level]] in ''Touhou''. Yet again, the cards they use on you depend on your character choice, as well as which one of them you focus your shots on. Their nameless non-spell patterns fill the screen with a truly ridiculous number of bullets on higher difficulties. These are the same every time, so it's possible to find a safe spot and/or memorize them, but if you get hit even once while dodging them, DynamicDifficulty kicks in and changes up the pattern, making memorization completely impractical.
** The main downside to playing as Sakuya is you're forced to fight Merlin at the start of the Prismriver Sisters battle. Why is this a downside? Because Merlin's gimmick is ''homing lasers''!
* Once you get past the Prismriver Sisters, there is another difficulty spike awaiting you - Youmu Konpaku. She keeps you company all the way to the final boss as miniboss of stage 5 & 6, but it's her boss battle that's evil. Her favorite method of attack is to throw dense AND rather fast (or just extremely dense) [[strike:clusterfucks]] layers of bullets, while giving you about 3 seconds of [[IncrediblyLamePun bullet]] [[BulletTime time]] to position yourself out of harm's way. In theory. You need a lot of practice to get used to this to the point you won't be reaching for the bomb key during every slowdown. Youmu singlehandely proves that reading-based spells can be just as hard as reaction-based ones. [[http://www.youtube.com/watch?v=CzQ6E6s_mKM Demonstration.]]

[[/folder]]

[[folder: ''Imperishable Night'' ]]

* Both level 4 bosses, that is, either [[MainCharacter Reimu or Marisa]].
** Reimu uses heavily patterned, but ''extremely'' dense clusters of spell tags, fires off powerful homing shots, and boxes you into small areas with her attacks. In the second part of the fight, she's usually zipping all over the screen, making herself nigh-impossible to ''hit''. Not so hard as she was in ''LLS'', but really hard anyways.
** On the other hand, Marisa's attacks are much less structured. She prefers to shower the entire screen with her deceptively large looking star bullets. Her first spell card generates spirals of huge stars, showers the field with tiny stars coming in from the ''sides'', and adds periodic shotgun-style blasts from her familiars. Then you get to the [[BeamSpam second]] [[KameHameHadoken half]] of the fight...

[[/folder]]

[[folder: ''Phantasmagoria of Flower View'' ]]

* Aya Shameimaru. She's fast as hell, and it doesn't help the AI makes her excessively cheap, dodging almost everything you'll throw to her. Usually you will lose one or two lives trying to defeat her, before the RNG goes easy on you and let you defeat her more easily, but even if you defeat her, you'll have yet to face Komachi / Yuka and [[FinalBoss Eiki Shiki]], which is [[TheComputerIsACheatingBastard even worse than Aya in terms of AI cheapness]]. If the character you're using finds her as your 7th opponent, good luck in trying to clear the game in one credit with that character. You'll need it...

[[/folder]]

[[folder: ''Shoot the Bullet'' ]]

* [[http://www.youtube.com/watch?v=KiK9zkAnD2c "Seamless Ceiling of Kinkaku-ji".]] The nightmarish new impossible request of Kaguya Houraisan is impossible for many a player indeed. It starts as a seemingly doable pattern of falling almost half-screen bullet walls and a spinning layer of bullets thrown around the stage to make it harder to approach her. Said layer gets thicker after each successful photo and reaches a ridiculous level for the last one - it's one of the scenes many people simply don't have the patience to clear.

[[/folder]]

[[folder: ''Mountain of Faith'' ]]

* Aya, from the past main game, returns as the stage 4 boss. The luck factor is vital for that fight, especially the survival card almost at the end.

[[/folder]]

[[folder: ''Subterranean Animism'' ]]

* Parsee Mizuhashi, despite only being a stage 2 boss, has become rather infamous for surprising players with how difficult her spell cards are. "Green-Eyed Monster" is particularly brutal, as she uses it when she encounters the players as a ''midboss'', and it's ''homing'', a quality typically reserved for the bosses of stages 5 and 6 in a ''Touhou'' game. Another gimmick not normally seen until endbosses is the DoppelgangerAttack, which Parsee also uses (her "[[FairyTale Tongue-Cut Sparrow]]" spell cards).
* Yuugi Hoshiguma in the stage 3 usually trips up players due to the sheer brute force of her attacks. Her final spellcard, "Knockout In Three Steps", is particularly brutal, because it's ensured you will lose at least one life if you don't know exactly what you need to do to pass this spellcard, and if you messed up... *pichuun*. She's often cited as a reason to not assume a character's strength from their placement in the game. One such argument spawned the NOT EVEN DROP meme.
** The first spell card she uses, Oni Sign "Anomalies, Strength, Disorder, and Spirits" is rather hard even on Easy. Yuugi shoots out a spiral of danmaku that are facing ever which way, before they go out in haphazard paths. You can get in the way of the spiral to not make those shots appear, but it won't really help.
* [[{{Telepath}} Satori Komeiji]] can be this, depending on who your [[MissionControl option]] is, as she uses that character's spell cards. Heaven help you if you're playing as [=ReimuC=] and aren't prepared for "Tengu Macro Burst" to come hurtling at you. If you are playing as [=ReimuA=], then have fun with Yukari's "Border of Wave and Particle", which was part of the extra stage of ''Shoot The Bullet''. And then there's [=MarisaB=] (Patchouli). Her torturous water cards are the ones that Satori chooses, even if one of them ("Princess Undine"), isn't one of the spellcards that Marisa remembers from her. Well, those and one of Patchouli's cards from the extra stage of ''[=EoSD=]'', the "Philosopher's Stone".
* Orin is almost universally declared the worst of them all. For beginners, there's the non-spellcards from the cat form in the stage 5 battle. Not so hard as it seems, but you can get clipped easily. Then there's the infamous "Cat's Walk" / "Vengeful Cat Spirit's Erratic Step". If you don't read the card's pattern correctly, well... And then, there's the actual boss battle. The zombie fairies are the least of your worries. Her third spell card, "Needle Mountain of a Former Hell" / "The Needles of Yore and the Vengeful Spirits in Pain", is really hard to read, due to the spinning ghost wheels, which are almost but not entirely unlike any other attack found in the series, and the bombs are useless against the wheels, so have fun.
** Her final encounter in Stage 6. For those that played ''VideoGame/BattleToads'', remember the final part of Stage 3? It's basically that, that is if you care about the spell card bonus.
* With this many ThatOneBoss characters, some fans like to joke that ''Subterranean Animism'' is That One Game.

[[/folder]]

[[folder: ''Undefined Fantastic Object'' ]]

* Ichirin, together with Unzan, in stage 3. Be prepared to deal with Unzan's fists while you try to dodge the other bullets and lasers.
* Captain Minamitsu Murasa, the stage 4 boss. [[AnchorsAway Giant anchors]], literal raindrop dodging, and a homing survival card, all at stage four. If she doesn't mess you up, then...
* Shou Toramaru, the stage 5 boss, definitely will do it. Many people have great difficulty with her, especially with the curvy lasers. Her [[ThatOneAttack most notable spell card]] is ''Most Valuable Vajra'' / ''Vajra of Perfect Buddhism''. The spinning homing lasers plus the other bullets make this card insanely difficult. It gives you so little opportunity to damage her, that with certain shot types it basically becomes a survival card too.

[[/folder]]

[[folder: ''Double Spoiler'' ]]

* [[http://www.youtube.com/watch?v=A-H3VJg6wIg Satori's "Vague Recollection of Kinkaku-ji"]]. See that example in ''Shoot the Bullet'' section? [[{{Telepath}} Satori]], being the [[ThatOneBoss troll]] she is, makes the players relive the horror again. This time, you only have to take 3 pictures... because the spell starts in the hardest mode. And the bullet pattern before the last photo is even harder than the original spellcard's hardest phase.
* Iku Nagae, the stage 10 boss.[[note]]This game has 14 stages, being just a BossRush with no actual levels.[[/note]] Though she originated in the fighting game ''Scarlet Weather Rhapsody'', and was not even the final boss in it, practically all her spell cards are a nightmare. Just try and capturing [[http://www.youtube.com/watch?v=NpYufA1YpzI "Pearl of the Five-Clawed Dragon" with Hatate,]] who makes ''every other'' card in the game easier. And then you get to [[http://www.youtube.com/watch?v=n8n--aJ2688 "Dragon Palace Messenger's Swimming Shot",]] which feels downright broken. No strategy or trick works against its combination of completely random curvy lasers mixed with completely random large orbs with big hitboxes. This is the last scene most people clear, usually by pure luck, if at all.

[[/folder]]

[[folder: ''Ten Desires'' ]]

* Yoshika Miyako, the resident jiang-shi of Stage 3, has the annoying gimmick of absorbing spirits that emanate from her body to restore health. If you don't get close to her to intercept the spirits, she can easily deny a spellcard capture, even if you are wailing at her health the entire time. In addition, she fires large, spread out waves of kunai danmaku that can be very difficult to deal with, especially with a forward shooting character. And that's not even getting to the problems Youmu has...
* Seiga Kaku by herself is weak. However, being a FlunkyBoss, she decides to bring in a bodyguard...which just so happens to be the ''previous'' ThatOneBoss, which makes her incredibly hard to hit. Fortunately, you can take Yoshika out. Unfortunately, [[WhyWontYouDie she'll come back to life after a few seconds.]]

[[/folder]]

[[folder: ''Double Dealing Character'' ]]

* Seija Kijin, the stage 5 boss. Do you remember Sakuya, Youmu and Reisen and how their gimmicks screwed many players? Well... she goes one step further, having the power of turning anything over, and she'll be glad of using this ability against you. She isn't as strong as other bosses in terms of bullet spam, but [[WeakButSkilled she doesn't need anything of that]] because of her ability. She screws you over by [[InterfaceScrew flipping the screen horizontally and your controls with it]] in one spell card, then vertically in the next, then rotates the screen 180 degrees every few seconds in her last spellcard. The patterns themselves aren't terribly difficult by Stage 5 standards; it's the screen flipping and rotating that makes her attacks brutal.

[[/folder]]

[[folder: ''Fangames'' ]]

* Megumi Yaobi, the stage 5 boss from the fangame ''Marine Benefit''. She has the gimmick of flooding the screen while giving the player a bubble to stay in; if your hitbox leaves the bubble for even a millisecond, you die. On top of that, she moves constantly all around the screen, making it very hard to actually deal damage to her. For her last nonspell, she even circles the screen while spraying bullets everywhere. And when you think it's over, she pulls out her survival card, The Eight Million Laughing Gods, which is ThatOneAttack to end them all. It's not unheard of to lose two or three lives to this one card.[[note]]The latest version nerfs EMLG somewhat, largely removing the threat of the moment which in previous versions was almost guaranteed to kill you, but even after the nerf the card still requires a lot of very precise movement at awkward angles.[[/note]]
** As if this weren't enough, she shows up again as the stage 6 midboss, and deliberately goes out of her way to block your path through the bubbles with the biggest projectile available to her - [[CollisionDamage Megumi]] [[GrievousHarmWithABody Yaobi]]. If you aren't prepared for this, and are just watching the bullets and the bubbles while paying no attention to the boss, [[WrongGenreSavvy as is typically expected of the player]], you WILL die. And even if you are prepared, the attack is nightmarishly difficult to read, considering how the bullets come from absolutely every direction possible for bullets to come from, all at once, without any pattern to speak of. Arguably the hardest attack in stage 6, and the player hasn't even seen the final boss yet.
* Utsuho in her ''Phantasmagoria Trues'' incarnation. She's only faced in Unlimited difficulty, but in every other difficulty, you had two options for who you faced in stage 4; in Unlimited, you're forced to fight Utsuho. This is a problem, since despite being only the stage 4 boss, she's actually harder than she was in ''Subterranean Animism'' - where she was the final boss! Her danmaku is ridiculously fast, to the point where in some patterns you can get killed by a bullet that didn't exist half a second ago, while her smaller bullets move in very awkward ways and love to wall the player at any opportunity they can get. All of this isn't getting into ThatOneAttack, ''Suppression "Hell's Helix"'', consisting of constant shifting walls coming at the player relentlessly from the ''sides''. Or the fact that in this game, Utsuho's suns are entirely hitbox, while in ''Subterranean Animism'', they were ''almost'' entirely hitbox - this may look on paper like a distinction without a difference, but in practice, [[DamnYouMuscleMemory far from it]]. Next to Utsuho, even [[PhysicalGod Eiki Shiki]] in stage 5 feels like a BreatherBoss in comparison.
** And then there's Ran Yakumo. She isn't a BonusBoss in this game, but when you get to Stage 3 on Advanced difficulty, you will desperately wish she was. Her patterns feature enormous walls, so large they can potentially cover a third of the screen or even ''more'', as early as her first midboss nonspell, which is followed by a spell that features walls with tiny gaps coming at you from both sides at once. Then it's taken FromBadToWorse with her actual boss battle, where she greets you with a survival card that forces you to [[ViolationOfCommonSense get ridiculously close to the red targeting circles that signify imminent death]] or else you die instantly - but don't actually touch the circles, [[MortonsFork or you also die instantly]]. And it doesn't get any easier from there, culminating in her final spellcard which constantly throws glowing walls at you from multiple directions, followed by a stream of knives that you need to dodge at the very bottom of the screen - when the angle of the walls Ran had been throwing at you made being high on the screen seem like the right strategy.
* Alice in ''Paper Tenko''. You first face off a giant puppet with 60 HP that hits you for 4 to 5 damage per turn when at this point you'll have around 30 hp at best. ''Then'' you face a 50 HP Alice. When at this point your HP was reduced to single digits, Alice ''will'' summon mooks constantly so you can't damage her with any attacks except the Celestial Stone Drill, launch said mooks at you for an attack that deals 10 hp damage, 9 if you time your button presses correctly. If you didn't stock on healing items back at Nitori's shop this will be a ''very'' painful battle.
* Takenouchi no Tarumi, the fifth stage boss of ''Riverbed Soul Saver''. She isn't content to just use one gimmick against you; no, she'll throw something different at you with almost literally ''every attack she performs''. Trying to wall you, shooting bullets at you from every conceivable direction all at once, doing so again while ''actively chasing you down'', throwing giant fists at you, then throwing anchors at you in case you weren't already having horrible flashbacks to ''Undefined Fantastic Object''. And what's her final attack? '''All of the above at once.''' Not even [[GameBreaker Liberation mode]] is likely to save you here.
** Not helping matters any is that she showed up as the stage 4 midboss...and she was a total pushover then. After the brutal WakeUpCallBoss in stage 4, and [[ThatOneBoss That One Midboss]] earlier in stage 5, most new players are relieved to see her as the boss, expecting a BreatherBoss fight. They'd be very, very wrong.
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