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There are many NPCs in .flow. They are often tied together with theories and are possibly part of Sabitsuki's past.
Cleaner
Gas mask wearing maids that can be primarily found in Sugar Hole, although they appear in other locations sparingly. They are sometimes referred to as "Gas Mask Maids," although lol's official art confirms that their intended, canonical names are Cleaners.
They are cordial and friendly towards Sabitsuki; interacting with them will cause them to politely bow towards her, and they will also bow if she curtsies to them with the Dress Effect. The one behind the bar in the Sugar Hole will also offer Sabitsuki snack cakes and tea in exchange for yen. Eating these meals will reduce the Erosion Counter and can eventually unlock new areas, a certain event, and even a unique Menu Type if enough are eaten.
One notably stands guard next to the Daruma Effect in the Sugar Hole's Cleaner World subarea, although she behaves identically to other Cleaners.
The Cleaners will all disappear once Rust's chapter begins.
Cleaners are prominent in the game's last two endings exclusive to Rust, where they seem very hostile towards her, outright attacking her in the game's final ending.
Spoilers end here.
Doctor and Nurse
Two medical workers that can be seen in a room in the Hospital. The nurse can also be found wandering around a room between Plant Corridors and Illusionary Corridors covered in plants.
Fetuses
Chasers that reside in the Deranged Mouth Worlds of the Visceral World. While they seem to move slowly, they occasionally gain tremendous bursts of speed and charge towards Sabitsuki; even with the Broom Effect, it is rather difficult to avoid them. Getting caught by them will forcibly unequip her current Effect with a burst of static, instead of transporting her to an inescapable area. Equipping the Television Effect and using it in these worlds will show a channel that appears to depict the screen coated in blood or rust.
Getting caught by one will raise the Erosion Counter by 3 points.
After Sabitsuki discards her Effects and becomes Rust, Fetuses become the game's main Chasers, replacing all Kaibutsu, and even appearing in areas that were otherwise safe. Fetuses will physically injure Rust if she is caught by them, her appearance growing more bloodied and maimed as she loses health. Rust can take damage 15 times from Fetuses before she collapses and dies from her injuries, forcing her to wake up.
Spoilers end here.
Gisokuko
A mysterious girl that Sabitsuki can find in sea, and what may be a younger version of her in the Hospital. Named for her prosthetic legs.
If she is killed, she will never respawn.
Hanako
A NPC that can be found in the Illusionary Corridors, surrounded by plants and two heart monitors. She gives Sabitsuki the flower Menu Theme.
Hospital Children
Children in hospital gowns found wandering the Back Ward. Some can also be found in the Illusionary Corridors with plants covering their bodies.
Inner Demon
An NPC resembling Sabitsuki with demon horns found at the end of the Rust Corridor. Killing them completes Rust's section of the game and lets the player see the Rust Ending.
Spoilers end here.
Jelly
Orange blobs found in the Apartments and Reverse Apartments. They rarely drop down from the ceiling in certain rooms, which can make for a potent scare.
Kaibutsu
Kaibutsu are the game's main chasers, and appear as somewhat bloodied students in uniform when passive, although they become much more bloodied and frenzied if angered. Getting caught by them will trap Sabitsuki in inescapable areas and will also slightly raise her Erosion Counter, depending on which area she was caught in.
Kaibutsu are completely replaced by Fetuses once Rust's chapter begins.
Spoilers end here.
Bar Kaibutsu
A lone Kaibutsu that sometimes appears at the Sugar Hole bar. While normally passive to Sabitsuki, they will violently retaliate if Sabitsuki attempts to kill them.
Shinsoku Kaibutsu
A typically passive Kaibutsu located in Blood Maze. If struck by the Iron Pipe, or if another Kaibutsu/Oreko has been struck in the same flow session, they will become aggressive and move at extremely high speeds. Sabitsuki cannot outrun it under any circumstances without utilizing debug tools to increase her speed to RPGMaker's maximum. If it catches you, it'll send you to an isolated section of the Orange Laboratory and raise the Erosion Counter by 10 points.
Its name, meaning "godspeed", comes from an in-game switch that triggers when the NPC is struck.
Little Sabitsuki
A small child resembling Sabitsuki. They can be found in several areas in the game. Notably in the Parade Ward, where they can be found in a hospital bed. Their current condition depends on the Erosion Counter; while they'll seem to be in good health if it is very low, they will quickly grow extremely ill if it increases. If the Erosion Counter is at or above 100 when visiting said bed, they will give the Rust Menu Theme when interacted with.
Music World Creatures
Several bright neon creatures that roam Music World. Similar to Yume Nikki's Neon Creatures, they come in various abstract shapes and sizes.
Onigo
Strange girls with long blowing hair covering their faces. Found in several areas, most notably Visceral World. They resemble the Nopperabou Witches from Yume Nikki.
Oreko
A girl who lives underwater and builds strange machines in her house. She gives Sabitsuki the Diving Helmet effect. Oreko also reappears in other parts of the game. She seems to have a very positive relationship with Sabitsuki, and is capable of lowering the Erosion Counter under certain circumstances.
Smile and Sister
A boy and girl with cross/plus tattoos/markings over their eyes. The boy has been called Brother in lol's art, but he is known best by his filename Smile. They can be found together in Smile's House, whereas Smile can also be found in a few other locations by himself.
Students
School children that can be found in various locations, including the School, fittingly enough.
Sugar Girl
A mysterious girl found in several areas deep within the game, most notably in the hole in girl. She also appears in an event in the Apartments.
Takibi-San
A girl who can be found in the outside areas of the Alleyway Hospital. She sits near a street fire and seems to be trying to warm herself. Her Japanese name comes from the word for "bonfire".
Witch
An 8-bit witch in Famicon World that gives the Broom effect when interacted with.