Alcopone is a villain from Soul Eater and is leader of a gang.
Blackstar was sent to Alcopone's location to assassinate him along with his associates. But Blackstar did not follow the rules of an assassin and showed off in front of the gang. After the two escaped, Alcopone was informed that the witch has been found.
On his way to hunt down the witch, Alcopone encounter Mafune. They were all soon killed though when the gang wanted to pass Mafune.