It's no secret that the ninja has a lot of hard elements to capture correctly. While the purge on the ninjato did some justice, there are many battle that still don't work, both for the ninja and their iconic leader, Hattori Hanzo. All of these are VCs.
https://deadliestfiction.fandom.com/wiki/User_blog:SPARTAN_119/Pirate_vs_Ninja_Rematch Many issues with this one. The fukiya, while somewhat attested in some sources, was likely used in extremely limited situations only. Mainly, though, the bajozutsu was strictly a cavalry weapon (hence the name, meaning "horseback gun) and the ozutsu was mainly used as portable artillery, not as a shotgun.
https://deadliestfiction.fandom.com/wiki/User_blog:Elgb333/Ninja_vs_Sicarii Not only was the fukiya very limited in use but this battle states it used fugu poison. I've never heard of any sources confirming this, not only for fukiyas but for the use of fugu poison in assassination overall. The most common poison/venom to use was torikabuto/wolfsbane.
https://deadliestfiction.fandom.com/wiki/User_blog:SPARTAN_119/Hattori_Hanzo_vs_Rashad_ad-Din_Sinan This is where I get to butchering Hattori Hanzo. The guy wasn't a ninja at all. He was a hatamoto who liked using ninjas a lot, but he himself wasn't one. There's no reason for him to use a wakizashi as his main sword instead of an uchigatana, nor reason for him to carry an ozutsu around (portable artillery) and the battle itself rests on the false premise that he was a ninja.
https://deadliestfiction.fandom.com/wiki/User_blog:MilenHD/Hattori_Hanzo_vs_Shaka_Zulu Same issues, but better in some regards and worse in some. At least he has the yari, which he was described to be very good with, but that's where the fun stops. Giving him shurikens is a thing, but why the hell would a samurai, or a ninja for that matters, carry around sais? Those are from okinawa, and were mainly used for law enforcement as batons.