Various types of leukocytes are involved in diapedesis, including neutrophils, monocytes, and lymphocytes. Neutrophils are often the first to arrive at the site of infection due to their high motility and quick response to chemotactic signals. Monocytes follow and differentiate into macrophages to phagocytize pathogens and debris. Lymphocytes, particularly T cells, are crucial for adaptive immune responses.