Black Sperm is an arrogant yet insecure monster. He is very confident in his abilities, shown in his willingness to take on Monster King Orochi, but he dislikes when other people "look down on him" for his appearance or personality, and if he senses that someone is doing so, he becomes furious. At the same time, he is willing to work with others in order to take on a stronger opponent, shown by his cooperation with the Monster Association.