Ekchuah
In 
Maya mythology, 
Ekchuah or 
Ek Chuah ("black war chief') was the patron god of warriors and merchants, depicted carrying a bag over his shoulder.  In art, he was a dark-skinned man with circles around his eyes with a 
scorpion tail and dangling lower lip.
In early modern studies of Maya art and iconography, he was sometimes referred to as God M before his idenity was firmly established.