Anti-Climax Boss: Most of the early bosses in Onechanbara Z2 are pitifully easy, with many of them putting up no challenge despite their massive sizes.
Both of Evange's forms is this on all difficulties, even on Berserk (you're constantly in an Enraged state). Your characters are probably near maxed out after subsequent playthroughs, and any player can just tag in all of the girls and bum rush her without taking that much damage. Most of her attacks are either shooting you with her small smgs, blocks that are easily breakable, half-hearted swipes, and maybe a couple of evades. It's telling when The Dragon is the hardest boss in the game.
Himiko, debuting in Bikini Samurai Squad, is a centuries-old scientist and the head of the Organization, a company that kidnaps people with Baneful Blood to perform experiments on. Kidnapping various men—including Anna's brother—Himiko injects them with the Blood to make them her obedient, indestructible aides. Desiring to gain eternal youth by drinking Saki's Blood, she unleashes an army of zombies upon Tokyo, sending out Misery and her indestructible aides to collect whatever Blood remains. After drinking the Blood, Himiko plans to rule the world and wipe out the entire Baneful Blood bloodline until she's the only survivor. Returning in Special, Himiko wipes Aya and friends' memories and places them inside a maze, preparing to kill them all and acquire more power for herself after they've completed it.
Z2: Chaos: Evange, real name Evangeline, is Queen Carmilla's head scientist and Misery's older sister who seeks to create a utopian paradise for her to rule over as its god. Desiring Baneful and Vampiric Blood to unlock the secrets of the Xtasy and Dare Drive modes, Evange manipulated Carmilla into starting a war between the Baneful and Vampiric clans, hoping to have both wiped out to make way for her own zombie clan. Getting Carmilla killed in order to seize the throne herself, Evange sends out her zombie army to slaughter mankind and distract our heroes, even sending out a resurrected Misery to take them out, valuing her as nothing but muscle. Despite her claims of constructing a world without conflict, Evange reveals herself as nothing than a power-hungry sociopath who wants to rule over a world of chaos.
Origin: Eva is the head of the Organization who seeks power through the Baneful Blood. Murdering Aya and Saki's mother and earning the wrath of Oboro, Eva manipulates Saki into hating her family, using her as a way to slaughter Aya and Oboro to take their Baneful Blood. Sending her zombies out to wipe out a hospital and an entire city, Eva also has expendable clones created to kill Aya and Saki, attempting to have one named Lei killed for gaining emotions. After sending Oboro to kill his daughters, Eva promises Aya and Saki that she'll eat their hearts before attempting to kill them both herself.
Demonic Spiders: The ogres of Z2, especially on the harder difficulties. Not only do they hit hard, but they can cause an earthquake that momentarily stuns one of the girls, but worst of all, they have a laser attack that hits for a lot of damage but also launches the girls into the air. And if there's more than one, they'll chain their laser attacks, keeping you in the air.
Fridge Horror: When wrinkly, decrepit Himiko transformers into a taller, youthful, voluptuous woman, her kimono no longer fits, revealing a skimpy g-string. The Fridge Horror is when ones realizes Himiko must have been wearing it prior to transformation.
Goddamned Bats: The crows. Only Aya's throwing knives (or Reiko's guns) are effective against them, and they only serve to slow you down.
While the PC port of Z2: Chaos runs at 60 FPS, the game's logic is tied to that framerate. The problem with this is that it doesn't have a built in framerate limiter at launch, meaning that it becomes unplayably fast unless you limit with something like Rivatuner (or VSYNC, if you don't mind potential input lag). That's on top of it having nearly no graphics options, and occasional sound garbling.
The PC port of Origin seems to dislike certain GPUs (mostly AMD, but some NVidia models are also affected), causing the game to run with a very unstable framerate below 60FPS, even on a high-end setup. There is a workaround for this: due to some bizarre programming in the game's internal code, the framerate issue can be fixed by running the game alongside an Android emulator. No, really.
Remade and Improved: Oneechanbara Origin to both 1 & 2. While the level design is nothing special, it's kept simple and structured compared to either original game. The highly improved combat, the addition of a parry button, improved story and narrative, and voice acting (lip syncing issues aside in the English Dub) make a much better experience.
Scrappy Mechanic: In Bikini Zombie Slayers, you do not instantly gain EXP from defeating enemies, unlike most RPGs. Instead, you have to collect yellow orbs that drop after you defeat them. What makes it tedious is due to the delay before they appear, which takes about 2-3 seconds after they are defeated. While you might casually hack your way to the hundreds of zombies on the area, the next thing that you're almost certain to do is to run around the spots where they've died, collecting those yellow orbs on the ground. The time spent in collecting the orbs could have been used in actually progressing through the stage instead.
So Bad, It's Good : The English Voice-acting for Z2. By no means bad, butnote with many illustrious voice actors such as Amanda Miller and Cherami Leigh it's very clear the actors are hamming up their performances. It works.
Surprisingly Improved Sequel: Bikini Zombie Slayers is generally held to be a piece of crap. Z2: Chaos is regarded to be a surprisingly deep, enjoyable, and fun Hack and Slash.
The prequel, Z: Kagura and its Updated Re Release, was considered this before Chaos came out. With two new playable characters, improved level design (basic, but they weren't full of padding like previous titles), some bosses that actually put up a fight, and a story that was easy to follow if someone hadn't played any of the previous games.
That One Boss: Xtatic Misery is without a doubt the hardest boss of Onechanbara Z2. Many of her attacks deal ludicrous amounts of damage and never allows you to get away from her to catch your breath. Her spin attack alone can kill one of the four girls in only a short amount of time.
They're Just Hiding: Aya and Saki pulls this after having been declared dead at the end of Onechanbara Z. Kagura and Saaya are meant to be their replacements.
Waggle: Bikini Zombie Slayers/Revolution (Wii). The huge problem with this game was the forced motion controls, and the lack of the options for the classic controller. Not knowing how to do the proper combos was such an annoying factor, that the developers didn't even bother to put the inputs in the manual, and a player had to shake the Wiimote or nuchuck a certain way to figure out the more complicated moves. And the game just loves filling the levels with enemies you are forced to fight 90% of the time, which can get tiring on the arms. A big factor on why the game didn't do so well on the Wii; especially in the West.
The Movie: Dr. Sugita is a scientist working for the D3 Corporation who created the zombies as a way to fuel his god complex. Needing someone from the Imichi clan to continue his research, he decided to use the young Aya, ordering his men to attack her father, then coercing Aya's sister Saki into killing him, taking her in as a servant who kidnaps people for his experiments. Ten years later, while searching for the now-adult Aya, he unleashes his zombies onto the world, causing an apocalypse. Kidnapping Katsuji's sister Asami and treating her as a pet, he turns her into a zombie once she disobeys him and sends her out to get Aya. Bragging to Aya about the death of her father, he unleashes a gang of zombies on her that end up killing Reiko.
Vortex: Himiko, the haggard leader of The Organization, created a drug to grant immortality that ended up turning people into zombies, using them to conquer the world. Seeking eternal life, she searches for Kei, a child from the Imichi clan, planning to kill her and drink her blood. Having Aya and Saki's parents killed when they were children, Himiko, posing as a woman named Misery, tricks them into helping her locate Kei, later seducing Saki into working for her. Drinking Kei's blood and becoming young again, she tries to kill Aya and Saki in order to completely wipe out the Imichi clan bloodline.
. The lyrics may be cheesy, but they're sung so energetically and the instrumental is so infectious that it ends up being amazing regardless.