* AdaptationDisplacement: This series is much better known in the U.S. and many Western countries rather than the 1970s anime it's rebooting, largely due to the fact that it was a centerpiece premiere in the US revival of the Toonami block.
* AntiClimaxBoss: After [[spoiler: Casshern loses to Dio]] in the penultimate episode, you'd expect a climactic battle in the finale, but no, Braiking Boss [[spoiler: simply dies on his own instead of being taken out by Casshern.]]
* [[SugarWiki/AwesomeMusic Crowning Music of Awesome]]: The majority of the soundtrack, which was composed by Kaoru Wada of ''Manga/{{Inuyasha}}'' and ''Anime/PrincessTutu'' fame.
* EveryoneIsJesusInPurgatory:
** Braiking Boss and Casshern come across as TheAtoner versions of {{Satan}} and TheAntichrist respectively.
** It's difficult to ignore the Messianic characteristics of Luna and her subsequent resurrection makes her very Christ-like…if whether she's helping the world or not weren't completely debatable.
** The obsession of the robots with killing Casshern and eating his flesh, convinced that doing so will make them immortal sounds like a twisted version of the Eucharist. Likewise, the fact that drinking Luna's blood grants eternal life invokes Eucharistic imagery.
* EvilIsCool: Braiking Boss hits the mark and runs with it.
* FoeYay: Dio and Casshern, so much. Given the show's propensity for hidden meanings and double entendres, it's probably intentional.
--> '''Dio''' : "If there is a meaning to life, then you are the meaning to mine, Casshern!"
* LikeYouWouldReallyDoIt: Did you think Casshern was dead at the end of Episode 21?
* MemeticMutation: People like keeping track of the number of times Casshern's name is said per episode.
** Also how many times he's called 'beautiful'.
*** [[{{Mondegreen}} DEVOUR CASSHEWS!]]
*** '''[[MadnessMantra KILL CASSHERN! DEVOUR CASSHERN!]]'''
* SuspiciouslySimilarSong: The theme song of Jin, a oneshot robot who sided with humans, sounds an awful lot like the theme from ''[[Franchise/{{Terminator}} Terminator 2]]''.
* UncannyValley: Subtly employed in the designs of the more humanoid robots. When paired with the rare glimpses we get of humans, it becomes apparent just how eerie the likes of Casshern or Lyuze look with their stylized facial structures and perfect features.
* {{Wangst}}: He has reasons to lament, but Emo Casshern might grate your nerves at times.
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