Okay,
Group 1:
Emmie - killed by Yuiki, of course...
TRC - Killed with a clue of K & U, Undiclosed killer....., Avan?
Group 2:
raison -
Hip... Hop... Hip... Hop....
Time for the bunny to die~
Those who run their mouth will feel my wrath...
Good night, sweet prince <3
Wrath,
That probably means Blood or Crest....
Group 3:
Ero - Killed by someone claiming s/he is a god.
Goddo has proven his innocence so that probably means Maria
Group 4:
PiFace- Split-personality, Aker?
Murasaki Cho - Trolololololo, the only peson I can suspect is Archer and only him.