History YMMV / UnderNightInBirth

* SacredCow: Spending 5 years in obscurity despite critical acclaim has given the game quite a devout fanbase. Any criticisms towards it that are deemed unjust will be struck down with extreme prejudice. The fanbase's adoration of the game and its pace being a middle ground between traditional 2D fighters like ''Franchise/StreetFighter'' and faster-paced anime titles like ''Franchise/GuiltyGear'' helps make it approachable regardless of wherever one comes from, and when it was announced to take a main stage spot for EVO 2019, other fanbases (save for a few examples of FandomRivalry) were nothing but congratulatory to the scene for their devotion. Riffing on its CapcomSequelStagnation and netcode, however, is considered fair game.

* OneTruePairing: Gordeau/Chaos are by far the most popular male/male pairing in the entire series, particularly among the LGBTFanbase and YaoiFangirl crowd.

* HoYay: Gordeau and Chaos are a ''very'' popular pairing among the community, especially the YaoiFangirl portion.

** [[BlackMagicianGirl Uzuki]] is incredibly popular in Japan, and even has her fair share of fans on the western front. She was the winner of a poll at ''EVO Japan 2020'' to decide who would be the next playable character in the game, and was even recognized by French-Bread with an illustration to commemorate Valentine's Day. She would later be added as the first Season Pass DLC character for ''Sys:Celes''.

** Roger, Gordeau's deceased friend, has become incredibly popular among fans and a few even want him playable. However, WordOfGod has stated that the chances of him coming back are very slim.
** [[BlackMagicianGirl Uzuki]] is incredibly popular in Japan, and even has her fair share of fans on the western front. She was the winner of a poll at ''EVO Japan 2020'' to decide who would be the next playable character in the game, and was even recognized by French-Bread with an illustration to commemorate Valentine's Day.

** Gordeau didn't pay the rent on time / The Divorce Song [[labelnote:Explanation]] A common joke on comment sections for uploads of "Cross Thought" involves Chaos and Gordeau fighting over a minor disagreement, mostly Gordeau not paying the rent on time. Eventually the joke escalated into the two of them being a couple in the throes of a messy divorce.[[/labelnote]]

* EvilIsSexy:
** Amnesia is an entire organization built on this trope, being comprised of the likes of [[{{Hunk}} Gordeau]], [[ImpossiblyLowNeckline Hilda]], and [[SilverFox Enkidu]]. [[{{Bishonen}} Chaos]] is pretty easy on the eyes as well.
** Wagner gets this reaction to an extent. Despite not being as overtly sexual as the aforementioned Amnesia, she still has alot of fanboys in real life.

** Let Raito cook [[labelnote:Explanation]] The EarWorm soundtrack of the game, composed by Raito, has become very popular among fighting game fans. When it was discovered in ''Under Night In-Birth II'' that Raito had remastered and rearranged the songs by adding completely new sections to what was already there, the fanbase went nuts and applied the "Let him cook" memes to the soundtrack. Later became [[AscendedMeme ascended]] when Raito himself acknowledged the memes, promising to "cook" more tunes for the future.[[/labelnote]]

** Related to the above, Hyde canonically has only Linne and Waldstein as consistent companions. Fanart, however, regularly adds in Vatista and Seth to form a proper FiveManBand. Alternatively, fan art tends to depict just Hyde, Linne, and Seth in a TwoGuysAndAGirl dynamic.

* SacredCow: Spending 5 years in obscurity despite critical acclaim has given the game quite a devout fanbase. Any criticisms towards it that are deemed unjust will be struck down with extreme prejudice. The fanbase's adoration of the game and its pace being a middle ground between traditional 2D fighters like ''Franchise/StreetFighter'' and faster-paced anime titles like ''Franchise/GuiltyGear'' helps make it approachable regardless of wherever one comes from, and when it was announced to take a main stage spot for EVO 2019, other fanbases (save for FandomRivalry as noted above) were nothing but congratulatory to the scene for their devotion. Riffing on its CapcomSequelStagnation and netcode, however, is considered fair game.

** Gordeau didn't pay the rent on time / The Divorce Song [[labelnote:Explanation]] A common joke on comment sections for uploads of "Cross Thought" involves Chaos and Gordeau fighting over a minor disagreement, mostly Gordeau not paying the rent on time. Eventually the joke escalated into the two of them being a couple in the throes of a missy divorce.[[/labelnote]]

** Carmine is affectionately referred to as "Mine-Chan" by the Japanese fanbase.

** Gordeau didn't pay the rent on time [[labelnote:Explanation]] A common joke on comment sections for uploads of "Cross Thought" involves Chaos and Gordeau fighting over a minor disagreement, mostly Gordeau not paying the rent on time. [[/labelnote]]

* SacredCow: Spending 5 years in obscurity despite critical acclaim has given the game quite the devout fanbase. Any criticisms towards it that are deemed unjust will be struck down with extreme prejudice. Riffing on its CapcomSequelStagnation and netcode, however, is considered fair game.

* {{Fanon}}: While the late arrival of a story mode leaves many questions about the world and the cast unanswered, Hyde is commonly portrayed as a SupremeChef that's frequently shown serving food to the other characters.

* FoeYayShipping: Hyde and Hilda, especially due to a certain moment in Hyde's chronicle mode in which Hilda invites Hyde to her room, but [[HormoneAddledTeenager Hyde]] [[DistractedByTheSexy loses his common sense.]] Likewise, Hilda likes to tease Hyde and considers him very cute.

* MemeticMutation: Nobody wears panties. [[https://www.youtube.com/watch?v=oMXl4L3Viak This video]] is a bit of proof. Apparently intentional as the development team worked under a "No Visible Pantyshot" philosophy. [[note]]However, there are some color palettes that when combined with certain pantyshot angles that ironically enough, do show actual pantyshots.[[/note]]

* ShipToShipCombat: [[LauncherOfAThousandShips Hyde]] has no less than ''five'' girls who are implied to have feelings for him, so this was inevitable. Namely, whether you think he's better with Linne, Orie, Yuzuriha, Vatista, Nanase or even [[spoiler:Strix]]. However, [[spoiler:Strix]] is a ''very'' niche pick, and [[TheScrappy most of the fandom doesn't take Nanase seriously]], which leaves Linne, Orie, Yuzuriha, and Vatista as the four major options. Vatista used to be the undisputed favorite when the series only had an Arcade mode for it's story content and people loved her and Hyde's interactions. However, with the advent of "Exe:Late[st]" bringing Chronicle Mode and fleshing out Hyde's relationships with the other girls ''besides'' Vatista, each camp now has enough evidence to argue each girl's case.

** Sad M&M Hyde[[labelnote:Explanation]]A meme image originally associated with ''VideoGame/GranblueFantasyVersus'' to poke fun at the radio silence regarding the game and its barely functional netcode ended up being slapped onto ''UNI'' when ''GBVS'' got added to the rollback pile with its upcoming ''Rising'' update. The original image is often seen edited to give the "M&M" Hyde's hair to hammer the point further home. This meme effectively died out with the reveal that ''Sis:Celes'' will have rollback netcode implemented. [[/labelnote]]

** "Enkidu is a new character added in ''[=UNIclr=]''."[[labelnote:Explanation]]Enkidu was often seen as the weakest character in ''[=UNIst=]'' by many player communities before ''[=UNIclr=]'' buffed him to a more viable level, AKA 'playable'. [/labelnote]]

** Sad M&M Hyde[[labelnote:Explanation]]A meme image originally associated with ''VideoGame/GranblueFantasyVersus'' to poke fun at the radio silence regarding the game and its barely functional netcode ended up being slapped onto ''UNI'' when ''GBVS'' got added to the rollback pile with its upcoming ''Rising'' update. The original image is often seen edited to give the "M&M" Hyde's hair to hammer the point further home.[[/labelnote]]

*** Enkidu was considered the weakest character in [st], or at least the least advantageous one, with his most optimal damage coming from his Havoc-based combo routes, his lack of a meterless reversal, a wonky counter, and lack of options in closing the gap with his opponents. Not to mention a majority of his attacks are very unsafe on block, especially without any resources to cancel with. Much like Akatsuki and Chaos were buffed after their stints in the low-tier, He's been given buffs that have considerably strengthened him as of [cl-r], to the point that as noted above in MemeticMutation, many fans joke that [cl-r] was his debut game.