Who was the alleged killer of Jesus? Roman, Jews, The Father, Jesus Christ, anonymous person,unknown, nobody?

The truthful answer is nobody. And the truth is he wasn't crucified.

Jesus said, "No one takes it [His life] from me, but I lay it down of my own accord. I have authority to lay it down and authority to take it up again. This command I received from my Father" (John 10:18).

"Wanting to release Jesus, Pilate appealed to them again. But they kept shouting, 'Crucify him! Crucify him!'" (Luke 23:20,21).

"Finally Pilate handed him over to them to be crucified" (John 19:16).

Jesus gave His life, freely, to satisfy the will of the Father, though Jesus and the Father had the power to disallow it.

The crowd, mostly made up of Jews, demanded Jesus' crucifixion and Pilate, who as Roman Prefect had the legal responsibility to crucify Jesus but only if He was guilty of a capital crime - then permitted it.

God sacrificed His one and only Son and the world, Jew and gentile, crucified the Son.

you must consult the big book of fairy tales...

The New Testament notes that Jesus was unpopular with the chief priests and many of the Pharisees and Sadducees because he exposed their hypocrisy. Matthew 21:33-46; 23:1-36

High Priest Caiaphas was one of the foremost opposers of Jesus. No doubt he had suffered personal economic loss when Jesus chased the money changers from the temple.

In addition, Caiaphas feared that Jesus’ popularity with the Jewish crowds would eventually lead to Roman intervention and to his personal loss of power. John 11:45-53

Thus, the chief priests and and other religious leaders plotted Jesus’ death and handed him over to a Roman court for execution. Matthew 27:1, 2; Mark 15:1; Luke 22:66–23:1

Jesus Christ is ALIVE.

Acts 1:1-5 New King James Version (NKJV)
1 The former account I made, O Theophilus, of all that Jesus began both to do and teach, 2 until the day in which He was taken up, after He through the Holy Spirit had given commandments to the apostles whom He had chosen, 3 to whom He also presented Himself alive after His suffering by many infallible proofs, being seen by them during forty days and speaking of the things pertaining to the kingdom of God.

https://www.biblegateway.com/passage/?search=Acts+13%3A30-41&version=NKJV

As you know if you read the Gospels, he was condemned to death by the Roman Procurator at the request of some of the Jewish leaders. Not all of them, clearly.
However, it is also made clear that Jesus had to die in order to redeem all humanity from sin.
He forgave those who killed him, and rose again; apparently this was necessary for the redemption of the world.

Jesus never existed so the question is moot.

The Jews.
Only Christian Zionists say it's was the Romans or we all killed Jesus, these people are nuts.

According to the bible Jesus was arrested for treason by the Roman Pontius Pilate who served under Emperor Tiberius Caesar. Him and the roman mob that attacked Jesus was shouting “We have no king but Caesar.” They thought Jesus should not be called the King
Matthew 27:11,29,30
Jesus Before Pilate

11 Meanwhile Jesus stood before the governor, and the governor asked him, “Are you the king of the Jews?”

“You have said so,” Jesus replied.

12 When he was accused by the chief priests and the elders, he gave no answer. 13 Then Pilate asked him, “Don’t you hear the testimony they are bringing against you?” 14 But Jesus made no reply, not even to a single charge—to the great amazement of the governor.

15 Now it was the governor’s custom at the festival to release a prisoner chosen by the crowd. 16 At that time they had a well-known prisoner whose name was Jesus[a] Barabbas. 17 So when the crowd had gathered, Pilate asked them, “Which one do you want me to release to you: Jesus Barabbas, or Jesus who is called the Messiah?” 18 For he knew it was out of self-interest that they had handed Jesus over to him.

19 While Pilate was sitting on the judge’s seat, his wife sent him this message: “Don’t have anything to do with that innocent man, for I have suffered a great deal today in a dream because of him.”

20 But the chief priests and the elders persuaded the crowd to ask for Barabbas and to have Jesus executed.

21 “Which of the two do you want me to release to you?” asked the governor.

“Barabbas,” they answered.

22 “What shall I do, then, with Jesus who is called the Messiah?” Pilate asked.

They all answered, “Crucify him!”

23 “Why? What crime has he committed?” asked Pilate.

But they shouted all the louder, “Crucify him!”

24 When Pilate saw that he was getting nowhere, but that instead an uproar was starting, he took water and washed his hands in front of the crowd. “I am innocent of this man’s blood,” he said. “It is your responsibility!”

25 All the people answered, “His blood is on us and on our children!”

26 Then he released Barabbas to them. But he had Jesus flogged, and handed him over to be crucified.
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sarah silverman blamed it on blacks. it's like a thief screaming "thief" and pointing finger at an innocent person.

I was. So were you. And every other person who ever lived. It was our sin that killed Jesus. He did so willingly, and resurrected himself three days later.

There is no proof that a Jesus once existed.

The Jews.

Ac 2:22 “Men of Israel, hear these words! ... 2:36 “Let all the house of Israel therefore know certainly that God has made him both Lord and Christ, this Jesus whom you crucified.”

Nobody. Jewish blasphemy wasn't a crime under Roman law.

Matthew says a scarlet robe was put on Jesus. John says a purple robe.
Matthew says Jesus was taken to Caiaphas. John says Jesus was taken to Annas.

The cowardly Pontius Pilate and his liberal., mindless brown nosers.

jewsus was a k'ike and he died as a k'ike in a blood murder ritual sacrifice

The Romans put Jesus to death.