Kivat III started out with a fetish for beautiful necks. Normal behavior for a vampire bat, really.
Shima advising Megumi against taking on Rook by herself may be standard mentor behavior, but takes on added meaning in later eps when we learn that Yuri finally dealt Rook a Game-Breaking Injury, and despite Otoya leaving her, eventually found closure.
Ever noticed how the "organic" Riders require members of two different races in symbiosis (bats or whatever Sagarc is, with humans or Fangire or anything in between)? Kiva Emperor Form has a major advantage in three races in one, and Wataru could even be considered two races at the same time, which lends added meaning to the "Emperor" name, since an empire is formed by colonising and subjugating other countries with unified rule. Four Is Death indeed.
The Rat Fangire from #36-37 could multiply. What are rodents known for?
The child whom Wataru, Otoya and Nago train in an effort to help him become Kiva in the Hyper Battle DVD. Where else have we seen this?
Kiva is a Rider that blends two races together. Ixa is the human side, while Saga is the Fangire side.
Of course none of the Fangires are specifically bird-themed. There are design elements of various birds within the Fangire themselves.
The Checkmate Four not having a knight piece representative was meant to signify the Four Is Death symbolization; however, knights do get represented in this series with Ixa, plus Rook was temporarily Ixa in the 1986 side of #31. As such, the minor Fangires could be interpreted as the "pawn pieces", especially Ryo Itoya, who appears a bit more frequently than the others in his level.
IXA had four users in each timeline, each of them fitting a certain motif.
Nago/Otoya: Main users
Megumi/Yuri: Females, mother and daughter
Kengo/Jiro: Anti-Hero (Kengo was going through a punk phase)
Ryo/Rook: Fangires, they also used the power of IXA shortly before their respective deaths
Although other factors result in the movie being hard to placenote while the presense of Kiva's Emperor Form but lack of Rising Ixa form suggest that the movie takes place between episodes 24 and 27, Wataru did not know of the Arms Monster's existance or the time Door in Castle Doran until much later, and Megumi didn't learn that Wataru was Kiva until later either, Wataru going to school in the movie makes some sense, considering that he is a shut-in - he'd have to have left the house in order to have gone to high school, plus his job was one that didn't require a high-school education.
Of course Ramon/Basshaa doesn't have as much prominence as the other two Arm Monsters; metaphorically speaking, neither did Shizuka when comparing her to the other characters primarily in the 2008 side. Comparatively, both Kengo and Riki/Dogga do get such arcs, but not entirely in the same prominence as the other major characters.
After ultimately finishing off Rook, Megumi temporarily became less prominent for a while. Said deed was meant to be closure for both her character arc and finishing where Yuri left off at. Once that burden was out of the way, there was not much for Megumi to do for a while, at least until Shima's order to assassinate Wataru, giving more screentime to Wataru's origins and his relationships with Taiga and Mio.
The unused Dark Kiva theme song, Exterminate Time, has in it's lyrics that every user of the armor will eventually lose or got separated from their loved one in one way or another. King loses Queen Maya to Otoya. Otoya was then separated from Queen Maya by death, due to the over usage of the armor. While Taiga, although these happened before he donned the armor, had his friendship with Wataru gradually soured and unintentionally caused Mio's death. In Taiga's case, he gets better in the last episode.
Neo-Fangires notwithstanding, Nago and Megumi managed to have a successful relationship and wedding in the end. All other major relationships in the series (indirectly) involve a Kurenai in some way, which resulted in tragic endings in some way. Up until Nago's eyesight was restored, Megumi didn't have specific sights for anyone in particular, just only on the receiving end from stalkers early on. Mostly the same goes for Nago. And unlike with Otoya and Yuri, not once did Megumi ever date Watarunote Although in #7, she wanted to take him out on a date, only for Shizuka to refuse and Nago to go with her instead., thus avoiding the love pains the other relationships had by the time she and Nago were married.
Episodes 3 and 4 deals with Wataru being the target of Aya Natsukawa/Moth Fangire, due to actions done by his father in the past. At first glance it seems like a typical Sins of Our Fathers for Wataru but as it goes on, Aya actually had a crush on Wataru's father and had been embittered after the Casanova Wannabe rejected her. What if her animosity for Wataru was actually more of a Woman Scorned case when Otoya consummated with another woman, especially when she's a Fangire that's not Aya.
What could probably be worse is if she knew that Wataru's mother is not just any female Fangire, but the previous Fangire Queen herself. For one, she's going Revenge by Proxy on him instead of his mother because she can't, or at least couldn't go after an important member of her race and/or she doesn't know where Maya is. What's not sure is if Aya would go after Wataru because she knew the Queen was publicly (among their race) labeled as a disgrace, but given that Aya was willing to commit the same taboo by loving a human, she probably doesn't care about that norm and her reasons are purely of the Woman Scorned variety.
Episode 27 and 28 has the mother of all "don't think about it" Fridge Horrors. Tanahashi (an artist who blamed the Blue Sky Organization for ruining his life) abuses his position as chief of police to frame them for crimes they didn't commit. Keisuke uses Castle Doran's Time Door to go back in time to prevent him from getting injured by the Cicada Fangire and causing the injury that made him swear vengeance against the Blue Sky Organization. In the original timeline Cicada Fangire was destroyed by Otoya and in the process injured Tanahashi into a coma. Keisuke prevents that and Tanahashi escapes (preventing him from every swearing revenge). Happy ending for everyone right? WRONG! By doing so, Cicada Fangire lived to then-present day 2008. So let me ask you this: how many innocent people did Cicada Fangire kill by having their Life Energy sucked out from 1986 to 2008 just so his friends would be safe?
