Race: Member of an unspecified alien species
Job: Hit-Man; first for a mobster than as Maxima's personal guard
Size: Somewhere around 7 ft tall
Weight: Probably pretty heavy
Hair: Grey dreadlocks
Reason for being: Kills for the thrill and the challenge, considers Hand-to-Hand combat to be the ultimate honor
Kills: In the tens of thousands
Superhumanly strong, tough and fast: Gets referenced as being like Doomsday a couple times but it was also mentioned that Superman's fought tougher.
Assume other forms of energy to travel: Can zip across the galaxy pretty quick this way, faster than your basic space ships. Capable of either carrying the skimmer or being able to transmute others via contact and travel as well. After Superman tracked him the first time he turns to another form of energy that neither Superman nor the skimmer can track.
Has the ability to read moves, Superman thought it might be nerves, elsewhere it's mentioned possibly the muscles, however it's done Massacre needs to be able to see you to do it.
He is essentially a cosmic-version of Mr. X.
Massacre vs Auron: