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Opus
From Warhammer 40k - Lexicanum
Opus was a Chaos Space Marine of the Black Legion, serving under Captain Scaevolla.[1]
Described as a bull of a Marine by Scaevolla, Opus's head was constantly filled with an infernal song which he sought to replicate as he fought. He was also notable for wielding his unit's autocannon in battle.[1]
Notes
It is never explicitly stated in Honour Among Fiends, but given the "infernal choir that sang ceaselessly inside his skull", it is possible that Opus is a Noise Marine or otherwise a follower of Slaanesh.[1]