Black Suits

 are the three bodyguards who serve the Tsurumaki family and are always shown wearing black suits and sunglasses. They are extremely loyal to Kokoro, are shown to be capable of almost anything, and grant all of Kokoro's whims and wishes. They follow Kokoro everywhere, except to school. They take care of Michelle's suit. They also take care of the other Hello, Happy World! members when they are in trouble. Kokoro and the rest call them "People in Black."