* 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~]]
*** In english, he shares voice actors with another [[LightNovel/{{Durarara}} very well-known troll who also acts as a walking berserk button to a constantly angry person]]...
** 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, Nagare, Totsuka, Rikio, and Awashima are [[Manga/JojosBizarreAdventure Giorno, Jotaro, Bruford, Joseph, Jonathan, 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.
* 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.]]
** [[spoiler: ActingForTwo / ActorSwap: Shiro and Weismann's voice actors share the roles of the Silver and Colorless kings - the voice stays with the body and their characters are drastically different. One wonders what they did to coordinate, to pull it off so epically.]]
** 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
*** At the same time, Kuroh is sort of a spoof on the types of characters Creator/DaisukeOno and Creator/MatthewMercer tend to play, what with his naive side and the whole tape recorder thing. Likewise, Shiro isn't your average high school student character, even when he is, and Neko isn't your average GenkiGirl. All of them actually require a lot of subtlety to keep them from becoming irritating, and their voice actors manage it.