[Kiltias]

I'm probably the only one who thinks this but how is the possibility that there is no real killer?

What I'm trying to go at is that is this:
There is more than 1 Killer.

For those who want an explanation:

Spoiler for 1st Game.:

First Twilight:
Victims: Kyrie,Rudolph,Gohda,Rosa,Shannon,Krauss.
I take it as symbolic that Gohda was killed here.The only Servant employed by Krauss thus doesn't belong to the group of Kinzo's most trustworthy servants.
That being Shannon,Kanon,Genji and Kumasawa.
However consider, what if Shannon was real.
George proposing to her seems like a good time for her to get out of the plan of the murder.Ultimately getting killed herself.
See fun point is:
It wasn't Nanjo but Hideyoshi who comfirmed her body.
I can see Nanjo lying but not Hideyoshi, what reason would he have?

Second Twilight:
Victims: Eva and Hideyoshi.
I note that it was Kanon and Genji who first arrived knocking on the door but noone answered.
At that moment the "seal" or "symbol" wasn't on the door.
However it only appeared after Kanon returned with Kumasawa with Genji's whereabouts unknown.
This can be simply done, consider what if noone was in when knocking?
Eva and Hideyoshi arrived when Kanon was gone however Genji awaited them and painted the seal on the door.As for the chain.
I declare no chain was set and Kanon using the Bolt Cutter was an illusion.
But for all we know it might have been indeed set and the murder actually happened after Kanon broke in.
Thus what we saw, was merely a perceptional lie created by Ryukishi as it was basically from the view of the 3.

Next up:
Victim: Kinzo
Considering he is dead before the start of all games.The one who "killed" him can only be someone who knew he is dead.
Natsuhi,Genji,Kumasawa and Nanjo.
Again:
Kumasawa was with Kanon.

Followed by:
Victim: Kanon
Everyone had an Alibi nor was it suicide and the one who declared him dead was Nanjo who shifted him to another room.
Faked and that easily.Evidence followed in the next twilights.

6-8:
Victims:
Genji,Kumasawa,Nanjo.
See the pattern?
Nanjo - involved in the first twilight.
Genji and Kumasawa - Second
Kumasawa - "Found" Kinzo with Kanon with Genji and Nanjo being one of the few knowing of Kinzos death.
Nanjo: Declared Kanon dead.
And who is best to know the dial to Kinzos study than a servant.
Regarding the murder of the 3:
If it happened during the call that would have been heard.
And after the call Battler and co. hurried to the room.
For the killer there was little to no time to have done the murderes and simply vanish without being seen.And I am sure the 3 did fight back to some extent.
Which makes me believe the murders happened before Maria was on the phone.
However I grant the possibility of an surprise attack.

And Natsuhis dead can be explained that Kanon simply shot the gun a tad faster.

Yet, keep note of Maria.Important for the next one

However as for the second game, I cannot think else except it was someone else.

Spoiler for Game 2:

1st Twilight:
Victims: Krauss,Natsuhi,Eva,Hideyoshi,Rudolf,Kyrie.
Absolute highly symbolic.
Tell me why would the killer of all things target the siblings of Rosa?
And even more suspicious:
Maria had the key and Rosa took the envelope and the chapel had Happy Halloween Maria written on it.

However, as of here, things change.

2nd Twilight:
Victim: Jessica
Killed by Kanon who once again faked his death,
A keypoint is this:
Kanon fell once again to the stake of Wrath.

4-6 Twilight:
Victims: George,Shannon and Gohda.
It should have been easy to do this when Kanon was alive.All he had to do was Gohda to open the door."Help me...."
Especially with the aid of the other servants.

Again who are last:
Nanjo and Kumasawa.
Killed at the servant room by a crazed Kanon.
Again his sudden resurrection and playing with his wound could have meant he never died and faked it again.And again he ambushed Kumasawa and Nanjo but was chased away by Genji who didn't say a thing as he was involved himself.

Game 3:
Again a nice scenario:

Spoiler for Game 3:

Unlike finishing last this time the servants are first.
But keypoint:
Together again.
Kinzo was a "victim" but he was dead since before the games thus one of them who had knowledge about this is involved again.
Can be easily explain, another fake murder.
This time Kanon and Shannon working together thus breaking the locked door cycle.However I am sure one betrayed the other.

2nd Twilight:
Victims: Maria and Rosa.
In Red:
They were killed by other people.
Not just a person but people.
And really I don't see Shannon or Kanon even together being so dominant over the two that Maria didn't even had a chance to run.

Next:
4-6th:
Victims:
Rudolph,Kyrie and Hideyoshi.
Keypoint here:
Kyrie thought the food was unncessary and shouldn't leave the guesthouse yet she did for an unexplained reason.
I propose this:
Maria and Rosa were not killed by the Kanon and Shannon due to the lack of the stakes as in this game there are only 5 stakes used.
So their murder had nothing to do with Beatrice.
Infact I propose Kyrie and Rudolph to be their killers.
As for the reason, the money and it explains why Kyrie suddenly wanted to leave.
And yes for those wondering, I am saying Rosa and Kyries murder took place at a different time.
That being:
The 3 went to the Guesthouse.
While Hideyoshi was kept buse they went for Rosa and Maria.
Followed by the murder of Hideyoshi.
As for the lack of stakes:
Symbolism again:
Kyrie and Rudolph taking down Leviathan and Belphegor symbolized that they took down the ritual.
Incidentally:
This is where Kanon and Shannon come in and are the ones who killed Kyrie and Rudolph and

7th and 8th:
Killed Krauss and Natsuhi.

I'm currently working at the next game.

However I my reasoning is this:

Spoiler for What I think.:

The epitaph about the witch and the gold resulted in people going haywire.
However regarding Maria:
Remember how Eva and Rosa found the gold?
I got my doubts regarding Rosa that she solved the riddle by herself.
Infact I'm saying Maria solved it and told her mommy.I just got my doubts that Rosa who could only solve 1 Wolf and Sheep Riddle solved the Epitaph while Maria has effortlessly solved them all.
Unknown to the little girl she made herself the new head and the others found out.
Chapel Murder:
Rosa took them out to ensure the head position and the money remains with her.The happy halloween writing was meant as congratulation towards her.Only Rosa was left and the opposition for the position taken down.
The other game:
Kyrie and Rudolph decided to to get the money themselves planning to kill and silence everyone ultimately succeeding in killing Rosa and maria.

And at the same time the Servants began their uprising.
Remember how we saw Rosa and Maria running from the furniture goats?
I propose they were actually running away from the servants in that game.

With that said it's like this:
Servants - Killer
Rosa - Killer
Kyrie and Rudolph - Killers

All depending on the game.
Now add that up in a single scenario.
Kyrie and Rudolph did rampage.
Rosa intended to take out her siblings.
The servants had their uprising.

At least for now as I still work on the others.