* AllStarCast: One of the few things known in advance despite the mystery during the promotional stage was that the voices would be done by a lot of well-known voice actors. To name a few, Creator/DaisukeNamikawa, Creator/DaisukeOno, Creator/JunFukuyama, Creator/MamoruMiyano, Creator/YuiHorie, YuukiKaji, Creator/MiyukiSawashiro, Creator/TetsuyaKakihara, Creator/TakahiroSakurai, and Creator/TomokazuSugita.
** The English dub (in line with Creator/{{Studiopolis}}' tendency to cast well-known anime voice actors) is like this as well, featuring Creator/SamRiegel, Creator/MatthewMercer, Creator/BenDiskin, Creator/PatrickSeitz, Creator/ToddHaberkorn, Creator/TaraPlatt, Creator/KeithSilverstein, Creator/ColleenOShaughnessey, Creator/StephanieSheh, and Creator/JohnnyYongBosch.
* HeyItsThatVoice:
** Yashiro's sounds like... '''[[Manga/AxisPowersHetalia PASTAAAAA!]]'''
** Saruhiko sounds like a certain [[Manga/DeathNote god of the new world]] when he giggles, and a [[SteinsGate MADDO SCIENTISTO]] when he goes [[SayMyName MI~SA~KII~]]
** No wonder Kuroh's such a good cook, he once was [[Manga/BlackButler one Hell of a butler]].
** It's also interesting to note that a bunch of the cast's worked on ''LightNovel/{{Durarara}}'' together in the past. [[Creator/JunFukuyama Shinra is Yata]], [[Creator/DaisukeOno Shizuo is Kuroh]], [[Creator/MiyukiSawashiro Celty is Awashima]], [[Creator/MamoruMiyano Kida is Saruhiko]], [[Creator/YuuichiNakamura Dotachin is Kamamoto]], [[Creator/YuukiKaji Walker is Totsuka]]...Compare those characters and you'll notice that they are in NO WAY alike. It's quite fascinating.
** Shiro, Kuroh, Mikoto, Reisi, Totsuka, Rikio, and Awashima are [[Manga/JojosBizarreAdventure Giorno, Jotaro, Bruford, Joseph, Johnny, Anasui, and Jolyne]], respectively.
** The English dub cast is an AllStarCast:
*** Creator/SamRiegel as Shiro
*** Creator/MatthewMercer as Kuroh
**** Which gives [[Franchise/TalesSeries Tales]] fans the weird sense of hearing both [[VideoGame/TalesOfXillia Jude and Alvin]] ''and'', simultaneously, [[VideoGame/TalesOfVesperia Flynn]] and some guy who [[{{Expy}} looks like Yuri]] and [[Creator/MatthewMercer sounds like]] Creator/TroyBaker.
*** Creator/StephanieSheh as Neko
*** Creator/KeithSilverstein as Mikoto
*** Creator/PatrickSeitz as Reisi
*** Creator/BenDiskin as Misaki
*** Creator/ToddHaberkorn as Izumo [[note]]This is the first Los Angeles role where he is credited under his own name. [[Manga/NurarihyonNoMago His previous]] [[VideoGame/FireEmblemAwakening Los Angeles roles]] were credited under the pseudonym "Todd Stone"[[/note]]
*** Creator/ColleenOShaughnessey as Anna
*** Creator/TaraPlatt as Seri
*** Creator/JohnnyYongBosch as Saruhiko
*** Creator/CarrieSavage as Kukuri
*** Creator/ErinFitzgerald as Chiho
*** Creator/KirkThornton as Daikaku
*** Creator/GrantGeorge as Rikio
*** Creator/LucienDodge as Tatara Totsuka and Adolf K. Weismann
* IKnewIt:
** Many people on forums and WMG correctly guessed that [[spoiler:Weismann's spirit is in Shiro.]] Doesn't make it any less epic of a plot twist though.
** Many people guessed that [[spoiler:Mikoto was going to be KilledOffForReal]] from early on in the series.
* MementoMacguffin:
** Yata's awesome wristwatch was given to him by[[spoiler: Fushimi.]]
* NamesTheSame: Mikoto Suoh shares both his first and last name with an entirely unrelated girl from ''Manga/SchoolRumble''. Technically speaking, the one from ''K'' typically has his last name romanized as "Suoh" while the one from ''School Rumble'' has hers romanized as "Suou", [[SpellMyNameWithAnS but it's still the same exact name]]; "ou" and "oh" are two different but equally valid ways to romanize a long "o" sound in Japanese.
* PlayingAgainstType: Creator/LucienDodge, best known for his young teenager roles like [[LightNovel/AccelWorld Takumu]], [[LightNovel/SwordArtOnline Keita]], [[LightNovel/FateZero Waver]], and [[Anime/{{Pokemon}} Chili]], voices Adolf K. Weismann; a 60+ year old ''villain'' (although to be fair, [[OlderThanTheyLook he doesn't look like he's 60 years old]] and is immortal). [[spoiler: This could be a subversion, as the said Adolf K. Weismann is actually the Colorless King, the ''real'' villain of the show, controlling Weismann's body and the real Adolf K. Weismann have been body-swapped into a 17-year-old Japanese schoolboy.]]
** PigeonholedVoiceActor: On the other hand, we have Creator/KeithSilverstein voicing a [[TheStoic stoic]] character; Creator/TaraPlatt as a stern, serious, adult woman; Creator/SamRiegel as an OrdinaryHighSchoolStudent ([[spoiler:[[SubvertedTrope NOT!]]]]), Creator/MatthewMercer as a {{Badass}} character, Creator/StephanieSheh as a GenkiGirl, and Creator/CarrieSavage as a [[{{Moe}} cute]] highschool girl