History YMMV / UltimateCustomNight

** The [[VideoGame/FiveNightsAtFreddys4 FNAF4]] Scream sound, due to being used by the two animatronics who get the most kills, [[spoiler: Nightmarionne and Nightmare BB]].

* EnsembleDarkhorse: Mr. Hippo has certainly spiked in popularity with his kill screens.

* JerkassWoobie: William Afton. If the theory that the game is about him condemned to his own personal hell is true, then he is this. To elaborate further, while he loses a lot of sympathy for being a mass murdering child killer and while his death was richly deserved, the fact that he's stuck daily fighting for his life against over 50 animatronics (some of whom he made himself and some including himself and his own daughter) and being violently ripped to shreds every time that he fails in some twisted purgatory or afterlife, with no chance to escape, is a horrifying fate even if he deserves it.

* AlasPoorVillain: [[BigBad William]][[GreaterScopeVillain Afton]] of all people falls into this if we go by the theory that the UCN represents an IronicHell where he's forced to always fight for his life against over 50 animatronics (some of whom he made himself and some including himself and his own daughter) and being violently ripped to shreds every time that he fails in some twisted purgatory or afterlife, with no chance to escape, is a horrifying fate even if he deserves it.

* ThatOneBoss: Funtime Foxy, and to a lesser extent, Toy Freddy, Foxy and Rockstar Bonnie. During attempts at 40/20 to 50/20, streamers found out multiple [[EasyLevelTrick Easy Level Tricks]], one of which is the plushie trick wherein leaving the camera on CAM 2 stopped [[CashGate Baby, Nightmare Bonnie and Nightmare Mangle]], fellow [[ThatOneBoss That One Bosses]], completely. The catch, however, is that you '''have''' to leave the camera on CAM 2 without switching cameras, as doing so immediately triggers the plush animatronics to attack you. Enter Funtime Foxy and Co., whose mechanics required switching cameras in order to stop them. While Toy Freddy and Foxy can be sufficiently ignored [[LuckBasedMission given enough luck]], you '''have''' to switch to Funtime Foxy during his showtime, and you '''have''' to find Rockstar Bonnie's guitar. The only real saving grace here is that there's a few seconds where you can switch cameras while the plushies switch and prepare to attack, allowing you to stop the other animatronics. There's also the Death Coin, which can be used on one of said "monitor" animatronics.[[https://www.reddit.com/r/fivenightsatfreddys/comments/8w0zfv/ucn_spoilers_quick_psa_regarding_the_plushie_trick/ More info can be found here.]]
* UnexpectedCharacter: While some were expected, and others were included on demand, no one saw '''Phone Guy''' being included coming at all. Some people were also rather surprised that Jack-O-Chica made the cut rather than Nightmare Chica. [[spoiler: Though she does appear as a [[SecretCharacter hidden animatronic.]]]] And no one even considered the idea that Old Man Consequences would get in, considering [[VideoGame/FiveNightsAtFreddysWorld FNAF World]] is a bit of an OldShame to Scott.

** [[VideoGame/SuperSmashBros EVERYONE IS HERE!]][[labelnote:explanation]] Both [[VideoGame/SuperSmashBros Super Smash Bros. Ultimate]] and Ultimate Custom Night have LoadsAndLoadsOfCharacters in full effect, not to mention both having the word 'Ultimate' in the title, immediately leading to comparisons between the two.[[/labelnote]]

* EvenBetterSequel: Uses pretty much all the mechanics of the FNAF series, throws in some new ones, is completely challenging to boot, and likewise funny as heck. General consensus is that it's a wonderful culmination of everything fans love about the series.
* FridgeBrilliance: [[spoiler:Fredbear]] being a PaletteSwap of [=FNaF1=] Freddy makes ''perfect'' sense when you think about it. Not only is it a great [[BookEnds Book End]], but the pizzeria in ''1'' is said to have a low budget (limited power, {{Gonk}}y animatronics, etc.); so Fazbear Ent. decided to take their tech a few steps backwards by simply just using what they had in the beginning.
* HilariousInHindsight: On April Fools Day, Foxy's (fake) mechanic was to you help you out when things were looking dire, referencing the theory of Foxy being a good guy. Come later, and Rockstar Foxy gets a similar mechanic (though he's not entirely good in this case).

* BrokenBase: In what will most likely be the last time [=FNaF=] uses this trope, Scott's decision to [[https://steamcommunity.com/gid/103582791462471180/announcements/detail/1699429118324043145 leave the UCN]] as is and not add a cutscene after 50/20. Some are relieved since they wouldn't have to spend entire days beating the mode ''[[HereWeGoAgain all over again]]'' just to get to a minute-long cutscene, while another camp is disappointed to see that there is [[AntiClimax no reward for]] DoingTheImpossible.

* EvenBetterSequel: Uses pretty much all the mechanics of the FNAF series, throws in some new ones, completely challenging to boot and likewise funny as heck. General consensus is that it's a wonderful culmination of everything fans love about the series.

* JerkassWoobie: William Afton. If the theory that the game is about him condemned to his own personal hell is true then he is this.
** To elaborate further, while he loses a lot of sympathy for being a mass murdering child killer and while his death was richly deserved, the fact that he's stuck daily fighting for his life against over 50 animatronics (some of whom he made himself and some including himself and his own daughter) and being violently ripped to shreds every time that he fails in some twisted purgatory or afterlife with no chance to escape is a horrifying fate even if he deserves it.
* MemeticMutation: Since the character roster debuted, people have taken it upon themselves to create their own versions with different characters, ranging from actual past characters like Shadow Freddy and Spring Bonnie who aren't confirmed for the roster, to characters from various fangames, to {{Joke Character}}s like [[MemeticBadass the fan]].

** To elaborate further, while he loses a lot of sympathy for being a mass murdering child killer and while his death was richly deserved, the fact that he's stuck daily fighting for his life against over 50 animatronics (some of whom he made himself and some including himself and his own daughter) in some twisted purgatory or afterlife with no chance to escape is a horrifying fate even if he deserves it.

* ThatOneBoss: Funtime Foxy, and to a lesser extent, Toy Freddy and Foxy. During attempts at 40/20 to 50/20, streamers found out multiple [[EasyLevelTrick Easy Level Tricks]], one of which is the plushie trick wherein leaving the camera on CAM 2 stopped [[CashGate Baby, Nightmare Bonnie and Nightmare Mangle]], fellow [[ThatOneBoss That One Bosses]], completely. The catch, however, is that you '''have''' to leave the camera on CAM 2 without switching cameras, as doing so immediately triggers the plush animatronics to attack you. Enter Funtime Foxy and Co., whose mechanics required switching cameras in order to stop them. While Toy Freddy and Foxy can be sufficiently ignored [[LuckBasedMission given enough luck]], you '''have''' to switch to Funtime Foxy during his showtime. The only real saving grace here is that there's a few seconds where you can switch cameras while the plushies switch and prepare to attack, allowing you to stop the other animatronics. [[https://www.reddit.com/r/fivenightsatfreddys/comments/8w0zfv/ucn_spoilers_quick_psa_regarding_the_plushie_trick/ More info can be found here.]]

* BrokenBase: In what will most likely be the last time [=FNaF=] uses this trope, Scott's decision to [[https://steamcommunity.com/gid/103582791462471180/announcements/detail/1699429118324043145 leave the UCN]] as is and not add a cutscene after 50/20. Some are relieved since they wouldn't have to spend entire days beating the mode again just to get to it, while another camp is disappointed to see that there is [[AntiClimax no reward for]] DoingTheImpossible.

* BrokenBase: In what will most likely be the last time this trope is in effect, Scott's decision to [[https://steamcommunity.com/gid/103582791462471180/announcements/detail/1699429118324043145 leave the UCN]] as is and not add a cutscene after 50/20. Some are relieved since they wouldn't have to spend entire days beating the mode again just to get to it, while another camp is disappointed to see that there is [[AntiClimax no reward for]] DoingTheImpossible.

* ScrappyMechanic: Oh, what's that? You wanted to have an easy night with only a few animatronics on a low difficulty setting? Well, sucks to be you, because Dee Dee can just burst in at any time and introduce a completely random new animatronic into the mix, whom you likely won't know is there until it's too late. [[SarcasmMode A fun feature indeed.]] On top of that, she may enable extra animatronics that aren't normally selectable, [[GuideDangIt with no description on how they work,]] and may rarely (and on 50/20, will always) [[spoiler: become a black and white glitchy mess called "Xor" in the files that summons ''multiple'' animatronics]]. Oh, and using the Death Coin against her doesn't work.

* DemonicSpider: 49/20 has been done by a few people, and all of them had to turn off Funtime Foxy to achieve it. Markiplier, who gave up trying to beat 50/20 also noticeably suffered from the fox's mechanic during his attempts at 50/5.

* ScrappyMechanic: Oh, what's that? You wanted to have an easy night with only a few animatronics on a low difficulty setting? Well, sucks to be you, because Dee Dee can just burst in at any time and introduce a completely random new animatronic into the mix, whom you likely won't know is there until it's too late. [[SarcasmMode A fun feature indeed.]] On top of that, she may enable extra animatronics that aren't normally selectable, [[GuideDangIt with no description on how they work,]] and may rarely (And on 50/20, only) [[spoiler: become a black and white glitchy mess called "Xor" in the files that summons 2 or ''3'' animatronics.]] Oh, and using the Death Coin against her doesn't work.

* ScrappyMechanic: Oh, what's that? You wanted to have an easy night with only a few animatronics on a low difficulty setting? Well, sucks to be you, because Dee Dee can just burst in at any time and introduce a completely random new animatronic into the mix, whom you likely won't know is there and you probably also won't know how to defend yourself against them. [[SarcasmMode A fun feature indeed.]] On top of that, in 50/20 mode she'll enable extra animatronics that aren't normally selectable, and does so in a more haunting fashion; using the token against her doesn't work.

** Then, Scott decides to randomly pick ''Dee Dee'' of all characters as 51st character.

* HillariousInHindsight: On April Fools Day, Foxy's (fake) mechanic was to you help you out when things were looking dire, referencing the theory of Foxy being a good guy. Come later, and Rockstar Foxy gets a similar mechanic (though he's not entirely good in this case).

* CrossesTheLineTwice: The Toy Chica cutscenes, which are gradually more and more obvious about her [[{{Yandere}} mental state]]; by the time she gets to Mangle, she says that she'll tell him she's taken several ''live hostages''.