- Big-Lipped Alligator Moment: The original game's partial ending, which comes out of absolute nowhere and is guaranteed to confuse the absolute hell out of you. It's not the real ending, though.
- Complete Monster: The second game has a pair of Eldritch Abominations for its Big-Bad Ensemble:
- Mother is a being residing in the Underworld and the one behind Yamijima Island's dark past. Once sealed away from the human world, Mother planned her return for centuries, creating avatars based on deceased women and sending them to manipulate male humans into breaking the seals trapping her. When her first avatar, Kanae, forms a bond with her intended human, the four-year-old Shu, and is killed by a group of fishermen, Mother engulfs the island with a red tsunami, killing most of its people. With the betrayal of her next avatar, Ryuko, Mother wastes no time in creating yet another one, Yuri, for the purpose of finding and killing Ryuko for deciding to live a normal life. Succeeding in her plans, Mother's first action in the human world is to attempt to kill the man who released her, and when she fails, Mother hypnotizes an adult Shu and makes him think that she is Kanae, just before devouring him alive.
- Though not directly affiliated with the history of Yamijima Island, Otoshigo proves to be just as bad as Mother. Believed to be Mother's mate, Otoshigo is a water-dwelling entity inhabiting the ocean surrounding the island who desperately seeks to kill Mother himself. Possessing the body of a 14-year-old schoolgirl named Ichiko Yagura, Otoshigo visits the island and sends his minions to invade the dead bodies of its citizens. When Ichiko is found by a police officer, Otoshigo takes control of her body and stabs the man to death, and then makes her see what she had done. Armed with a submachine gun, Otoshigo slaughters several Yamibito in his way, laughing like a child in a playground. Before he could be defeated, Otoshigo transformed Ichiko's body into a deformed monster, forcing Yorito Nagai to end her suffering. Acting more like a depraved Serial Killer than a regular malicious spirit, Otoshigo was evil to the point of being feared by his own servants.
- Fan Translation: "Shibito" literally means "dead ones" or "dead people." Creative fan translations sometimes call them "deadites," after the Evil Dead franchise. "Yamibito" (yami meaning "dark") is sometimes creatively called "Darklings."
- Goddamned Bats: The rifle-armed Shibito in the first game.
- Any Shibito armed with an automatic weapon in the sequel, they have infinite ammo, are only slightly worse shots than in the first game and will fire bursts of around 7-8 shots (in a game where around 4 kill you on Hard mode.) at you and can be VERY persistant since they're usually Military Shibito, which have advanced AI (Chase you for longer and investigate open doors.) and a good few levels give certain Automatic weapon Shibito Special advantages such as never needing to reload (Yorito's level at the apartments), always knowing where you are (Misawa's level at the apartments.) or completely ignoring Beartraps/distractions, it's worse in Yorito/Misawa's levels as they tend to usually make up a good chunk of the enemies and it only gets worse on Hard mode where a single burst is death.
- Harsher in Hindsight: Remember what happened to Ichiko before the events of the game? Now look at what happened in South Korea about nine years after the game came out.
- Narm Charm: The British voices from the first game can be this for some. While the fact that all the characters are Japanese and obviouly wouldn't be speaking English at all (nevermind with British accents), the fact that the voice actors don't go so over the top like the English voice actors in, say, Blood Curse do (mostly because they were basically all anime voice actors) makes them sound more like real people than someone reading from a script.
- Nightmare Retardant: If you're unfamiliar with Japan's gun lawsnote , Yoriko Anno asking "is that a real gun?" in response to Professor Takeuchi pulling a revolver from his bag can serve as this.
- Rescued from the Scrappy Heap: Yoriko Anno spends most of the early game whining about how miserable she is and bugging Professor Takeuchi or whomever else she gets partnered with. After she gets shot, however, and gets a blood transfusion from Kyoya Suda, she apparently gets a dose of his nascent badass-itude.
- Scrappy Mechanic: While the 'Sightjack' feature (being able to see through the eyes of any NPC character via a FPS camera) is generally well received in the first and second game, the third game's variant attracted a number of complaints. You had to shuffle between one vision to another instead of manually finding one, all visions had a double-vision filter effect that not only reduced the frame rate, but it made tracking enemies movements more difficult to focus on. While the ability to split the screen into two and 'Sightjack' while still moving sounds great on paper, it was only useful if the player's TV monitor was widescreen, and even then the double-vision filter effect is carried over in the gameplay screen as well.
- The reveal that Tomoko has slowly been transforming into a Shibito is both terrifying and utterly heartbreaking, especially when her parents scream in terror at finding her in that state, and rather than breaking in and attacking them, she merely slumps her shoulders and walks away sadly.
- There's a scene in Blood Curse where Seigo is approached by one of his nurses Yuki, who is now a shibito. However, instead of trying to attack him, it looks more like she's reaching out to him for help, almost begging, even. Seigo immediately shoots her in the head, and she looks utterly heartbroken before she collapses. And then Seigo kills himself.
- That One Level:
- Reiko escorting Harumi through the school in the first game. Mainly thanks to a game 'feature' where collected items aren't kept if you die and continue, even from a checkpoint after when you collected those items. Here, it's required that you use Harumi to grab an item just before the halfway checkpoint in order to proceed with the game, and so any deaths in the level will require you to start from the very beginning, lest you miss the item. Did I mention Harumi literally can't get anywhere NEAR a Shibito without dying, or that her AI routine for this level (seek a hiding place whenever you get caught) sometimes causes her to run BETWEEN you and an attacking enemy?
- Bella having to sneak through a house occupied by a family of Shibito in Blood Curse, mostly for the same reasons. Being a 10-year-old girl, you will basically lose instantly if you even alert a Shibito and are not close to a hiding spot. Despite this, the stage is actually relatively quick and painless... if you do a normal run through without picking up any archive items. Going for them all is what turns it into the single longest and most difficult stage of the game. For the most part, this game fixed the earlier ones' issue where items aren't kept if you die and continue, but for some reason, this doesn't apply to the archive items from this stage that are also counted as inventory items and are all required to get another archive a few stages later, meaning that if you're going for them and you ever die, you have to restart the entire stage and do it all again in one go to keep those items. On top of this, a pathing issue causes two of the three patrolling Shibito to get stuck on each other in the first-floor hallway every other playthorugh, which makes a normal run where you never have to go back down there trivial, but forces you to alert them and run like hell to get them free if you want another archive which in itself also requires alerting one of them while hiding in the same room they spend most of their time in. Lastly, another two archives require you to actually get out of the house, then ring the doorbell when only one of the Shibito is on the ground floor and sneak back in to grab the one that's required for the other. The absolute worst part about all this, too, is that getting the archives sequentially makes the rest of the stage just that bit harder because the Shibito react to you messing with them and alter their patterns, mostly taking shorter loops that give you less time to move around, but one of them also extending their patrol to include outside the house after you grab the penultimate archive, which means if you don't take your time you can easily get stuck between her on patrol and Shibito Melissa right at the very end of the stage.
- Soji's last level in Siren 2, you start with a weak melee weapon if you didn't find the nail and hammer for the nail bat in the last level, You have an enemy with an Assault Rifle right at the start (Who can and WILL shoot you from the start on HARD mode.), taking him down for his rifle is pretty much only possible with the Nail Bat and at the very end is Yambito Misawa who if you don't shoot him before he gets alerted for extra damage and in the back, can take every single bullet from an assault rifle and still have a bit of health left forcing you to rifle-melee him to death and even then he revives in a second forcing you to just grab his rifle and run from it, oh and if you alert him but escape? he pretty much combs every hiding spot in his section, which is almost impossible to avoid on HARD mode, He's arguably the toughest boss in the game for this reason since while taking him out is technically optional, it's very hard to avoid doing on HARD mode.
- Tier-Induced Scrappy: Although the female playable characters in Siren are generally weaker and run slightly slower than the males, in Siren 2, the female cast are notably even worse in many other ways. In Siren 2, they open/close doors slower, ready/lower their weapons slower, have terrible attack range when using melee weapons, and run at a snail's pace upon losing all stamina. Ikuko Kifune is a notable offender as her special ability to control an enemy via 'Sightjack' drains her stamina, meaning that she'll get exhausted very often.
- Uncanny Valley: Dear God, the faces in the original Siren game. This was long before Heavy Rain and LA Noire got it right with having motion capture points on the actors faces to add to the character models, so Siren had to film the actor's faces and photoshop them onto the characters. This, as you can imagine, looks◊ borderline◊ grotesque◊. That being said, it does make encountering the Shibito all the more terrifying due to how horrifically off they look compared to living characters, especially if it's a unique Shibito with a recognizable face.
- What an Idiot!: Mamoru Itsuki in the second game. See Nice Job Breaking It, Hero!.
- The Woobie: Harumi in the first game, Shu and Ichiko in the second.
YMMV / Siren