Chapter 1.
-The place is old (note: paintings, peeling/dried paint and wallpaper)
-Bedroom groupings: 3 bedrooms in total; one bed for the females (Amy, Rouge, Wave, Cream); second bed for Sonic, Tails and Knuckles; the third bed was for Silver, Shadow, Jet and Storm
-The killer lured Tails downstairs into the dining room, to be killed in the kitchen, a completely separate room. The killer could have been waiting in the dining room while Tails was in the kitchen, or was already in the kitchen when Tails entered
-Tails retrieved a glass out of the cupboard, completely random in choice
-The killer cannot be any of the Babylon Rogues (Tails ripped HAIR off the killer. The Rogues are all birds, hence feathers)
-Tails managed to grab WHITE AND FLUFFY hair from his attacker
Chapter 2.
-Sonic and Knuckles were first to enter the kitchen
-Amy and Cream start to cry when they see Tails’ dead body; Cream is later killed but that still leaves Amy who may be faking her tears.
-Shadow entered the dining room later than everyone else
-Knuckles is quick to blame Shadow because of his late entrance
-Knuckles and Shadow commence a physical fight; Silver rushes in to break the fight up and now Silver is still in the cellar
-Shadow or Knuckles could have locked Silver into the cellar to keep him quiet
-Jet was the one to prove Shadow innocent, as he saw Shadow was still in bed when he rushed out the door
-Knuckles may have a guilty conscience
-They all exited, one-by-one, out the same way, back up to bed
-Sonic was the only one that remained in the kitchen when the others went back up to bed
-Murder weapon was a knife, the killer was cloaked. The knife still had blood stains on it
-Sonic hid the knife under the sink before leaving to go back to bed
Chapter 3.
-Amy got Sonic to come and break up the second fight between Knuckles and Shadow
-The mansion doors are locked; no one can open them
-Shadow may have known Rouge was following him when he went downstairs and he pretended to try and open the doors
-Amy and Cream were the discoverers of Storm’s dead body
-The word, “BABYLON” was smeared on the walls of the bathroom (with blood)
-Storm had been killed by being stabbed in the back with a knife
-Everyone walked out of the bathroom, except for Knuckles
-Knuckles is so determined to prove that Shadow is guilty, perhaps to cover up his own guilt
-Jet black hairs were found under the toilet seat by Knuckles
Chapter 4.
-Knuckles mentioned that he found the fluffy, white hair in Tails’ hand. In earlier chapters, he never said that he found the hair. How would he know about the hairs if Tails’ body is gone.
-Tails’ body is no longer where they left it
-The cloak and knife found by Sonic are no longer under the sink
-Knuckles found a camcorder that recorded the events of Tails’ murder
-Storm’s body is no longer in the bathroom; this makes everyone uneasy
-The bloody message smeared on the wall is also gone
-Knuckles didn’t tell anyone about the events of finding the camcorder; he stayed in the workshop which is located in the back of the house, not going for meals at all
-Sonic became worried about Knuckles’ whereabouts that he asked people to search for him; Sonic and Silver searched the bottom floor of the mansion while Cream and Rouge searched the first floor, leaving everyone else to enjoy the night
-Silver and Sonic split up and Silver is interested in an open door before heading into the main dining room; he is pushed into the cellar and locked in there
-The person who locked Silver in the cellar pushed a sturdy object in front of it, blocking out Silver’s yells for help. Only someone strong could have pushed something that sturdy and strong in front of a door
-Somebody shouted Silver’s name, causing him to run up the stairs to the blocked door of the cellar.
-A blood-curdling scream was heard, probably attacked by the killer so that they didn’t find Silver
Chapter 5.
-Cream was not the one shouting Silver’s name because she was dead for at least 20 minutes before anyone discovered her
-Rouge was the first one on the scene of Cream’s death
-Two possibilities for Cream’s death; the killer was waiting in the toilet to murder Cream or she committed suicide
-Blaze wants to search for Silver alone; she either is caring about him or wants no one to find him because SHE locked him in the cellar
-Sonic was split up from Cream, so he may have killed Cream
-Silver found a torch in the cellar and also found a large letter ‘K’ engraved on the cellar wall
Chapter 6
-Silver’s theories about the ‘K’ on the wall; ‘“If it was Knuckles, I don’t think he’d carve a K into the wall to signify that he is actually the killer,” Silver thought, “but then again, he was quick to blame Shadow, and he could’ve carved the K to make it look like somebody framed him.”’
-Blaze was killed after finding Silver in the cellar; she tried to move the object blocking the door but it didn’t budge, she then was killed and dragged off
-Blaze was murdered because she was looking for Silver; the possible encounter with the two remaining Babylon Rogues could have something to do with it, maybe they killed Blaze because she was getting close to Silver

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Judging from these notes, gathered straight from the story, Jordzz and I have given points to the characters for the clues that add to their suspicion. In order from most suspicious to least suspicious, these are the characters and their points.

Knuckles: 8
Shadow: 7
Amy: 3
Sonic: 2
Jet: 2
Wave: 2
Rouge: 1
Silver: 0

I'm starting to suspect Sonic. In chapter 1, he doesn't hold Amy's hand. Could this be because he knows he is going to kill her? Then, he toys with Amy and Cream by scaring them and could be getting them into the mansion to make sure they don't run away. Possible? Tails' death. Hmmm... Sonic could've used his super speed to run upstairs again, dumping his cloak and knife down carelessly, so he could come downstairs with everybody else so he wouldn't seem suspicious. The only thing that doesn't make sense there is the white and fluffy hair. What's that? Hmmm...
When Sonic said that the killer was careless, he could've been talking about himself, before hiding the cloak.
Sonic could've locked the mansion doors that night, to make sure no-one could escape. Sonic could've taken the cloak and knife from the cupboard to kill Storm, then hid them somewhere else. Possible?
He could've hid the bodies before anyone went back. He could've recorded Tails' murder to show it to his last victim before killing them. Possible?
He could've asked everyone to search the house for Knuckles so that he could strike someone else. Silver and Sonic split up. Cream was in the bathroom. Sonic could've killed Cream when she was alone and then soon after locked Silver in the cellar, pushing the bookcase in front of the door so that no-one would find Silver. He could've engraved the K on the wall earlier to further raise suspicion of Knuckles. Then, when Blaze found Silver, he could've been waiting and killed her too.

It's possible. I'll say Sonic for now. Could he have had his gloves off or something when he killed Tails? Could his hands be white and fluffy? You have to think of everything possible.
My prime suspect is Sonic atm.

I finished reading everything up to this post.The killer can be Sonic, Knuckles or Shadow because when Sonic finds the note on the floor, the 3 of them are in that spot.I suspect that from the 3, Sonic or even Shadow (it may be too obvious but maybe DA wants to put it that way so we don't suspect of him) can be the killer, although my vote goes to Sonic for the following reasons.

1)He accepts very quickly the deaths(Amy's death can easily be faked).
2)He gets last to Blaze's death scene which means that he could have killed Amy while everyone was at the crime scene.
3)To prevent someone from suspecting him Sonic writes a letter to himself and puts it on Amy's hand.
4)Diableos makes chapter 8 to stop suspicions against Sonic, he even says to Yoshi007 (I think) if he still suspects of Sonic..

Now, if there are multiple killers, I wouldn't know what to think

Wow! That's really good!

that was very good

Great start! That reminds me, I have to post my newest chapter... Keep up the good work!

I second this. No repetitiveness at all in comparison to LM's fan fiction. You seem to have taken the concept and made it your own. Well done, I certainly look forward to the newest chapter.

And the white fur? Well that surely would mean Silver killed Tails... or does Storm have white fur too? Hm.. a mystery unfolds already!