I wanna share this theory i made about the final villain of paper lily , took me quite a bit of thinking , i hope somebody likes it :D
The Final Villain of Paper Lily REVEALED *THEORY*
Let's list all of Hiro's suspicious activity and based on that we can guess a resonable motive.
1) He's oddly enough an intellectual and into mystic and folklore just like Lacy.
2) She gives Lacy a CellPhone that can call to another dimension , it would be more accurate to call Lacy's cellphone a Magical Artifact.
3) Mentions a very spooky poem about the age old question "How to predict your fate ?" dealing with the most important animal in the game Crows .
4) Also briefly mentions a folklore story about Eating the heart of a witch
5)In the "salt is for cooking" ending , he is seen missing an Eye and is injured in the abdomen after the ritual fails
In the forest talking with Lacy on the phone
Hiro : "How are you ? How are you calling me ? Are you back ? Did you find out-"
This line makes no sense , Hiro gave the Magical Phone to Lacy and for some reason he thinks she shouldn't be able to call ? He quickly asks if Lacy "is back" meaning that Hiro thinks that Lacy shouldn't be able to call unless she is "back" in the human world.
But this implies that Hiro is fully aware of Lacy being in another dimension , this fact has strong implications on Hiro's true intentions , because why would the Ultra Protective Brother let her sister travel to another dimension filled with human eating demons.
i can guess some possibilities
1) Hiro doesn't care about Lacy safety and is EVIL
This is unlikely because Hiro had every chance to harm Lacy for years , why did he not act ?
because he is not evil , that's my guess
2) Hiro cares about Lacy safety and actively helps her to achieve her goal in the demon world
So we are left with a shocking logical conclusion
Hiro that we meet in the house is not the same Hiro we talk with on the phone
Let's call whoever is talking on the phone with Lacy as Fake Hiro
This would explain how Fake Hiro is surprised that Lacy can call , and most importantly never asks the most important question that any worried brother would ask. Where are you ?
Now let's question what triggers the attack of the demon in Lacy's house , you might say "well that's easy , interrupting the ritual triggered the attack"
i disagree
The demon is ALREADY in Lacy's house BEFORE she interrupts the ritual ( the demon footsteps are present as soon as you wake up at midnight) wich means that Something else triggered the presence of the demon , i think it can only be 1 thing , drawing the eye on the door as part of the ritual.
You can notice that the specific action of drawing the eye on the door Triggers the call of the neighbor ! He is watching us from the windows !
(from my testing the conditions to trigger the call of the neighbor are 2 , the door has to be painted with the eye AND the lights need to be off , the creep is watching ! after these conditions are met i believe there is a RNG activation when you enter or exit a door)
btw if you need further evidence that the presence of the demon wasn't caused by the interruption of the ritual there is proof in Lacy PC in the Devil Eye forum posts , the post from 11 months ago from pklurker says "Any tips for the bus ritual ? i started it the other day but couldn't go through with it , after i finished the preps it felt too real , still wanna try it at some point ! ".
You can deduce from the post from 7 months ago that the user "Kasaju_86" ( the same user that warns to get off the bus before the end of the line) agrees with me , interrupting doesn't cause any harm.
Here my guess of the logistics
The Demon possessed the Human neighbor to watch Lacy from a distance , noticed Lacy starting the ritual when he saw the Eye on the door and decided to act because she was about to go to a location harder to reach, this made the Demon accellerate his plans , he possessed Hiro and likely had a fight with him and decided to Kill Lacy that night.
So in the timeline where Lacy takes the bus , Hiro fights the demon and still gets possessed.
Hiro was likely a deterrant to the demon acting his plan at any point prior to the ritual, also the ritual likely amplifies the ability of the demon to possess a human.
As to why would the demon kill Lacy i have only 1 guess
Hiro : "Eating a witch's heart can grant any wish"
The Demon wants to eat Lilith's heart !!!!!! ( remember Lilith is inside Lacy )
The Demon and Lilith might have some type of evil distorted love story , The Demon was looking for LIlith heart in the human world probably for a long time.
Who is the lover of Lilith in Folklore and some religions ? a certain demon , his name... the name of Hiro's and Lacy's Killer ! ( in the bad timeline )
Samael
Does this name ring a bell ? well we have Lilith and her Human counter-part Lacy
and now we have Samael the lover of Lilith and Well.. who is the lover of Lacy ? Sai !
Lilith and Lacy
Samael and Sai
So in conclusion, we reasoned that
1) Hiro is still possessed by Samael in the good timeline
2) Sai is related to Samael in some way
3) Samael wants Lilith's heart
4) Samael is an evil demon connected to all the important characters in the story so far and is likely the final villain.
I hope you enjoyed the read :D