Black Coffee Mug is usually a tired, sleepy, depressed, quiet and overworked ofídicas worker, who is usually seen as tired and never smiling due to his seemingly apathetic nature. Due to being overworked and having low pay due to his job as an office worker under ObjectCorp, he seems to be a careless and emotionless person but is actually loyal to his family. Because of being separated from his real family by his birth father, he is loyal to his adoptive family as it is only family he has left.