Mi-ko Pettan is the cheerful and adventurous protagonist of the series Sukumizu Pettan. Known for her energetic personality and playful antics, she often finds herself at the center of comedic and heartwarming situations. Mi-ko is recognized by her fondness for school swimsuits and her strong sense of friendship, which helps her bring together a diverse cast of characters. Throughout the series, she plays a pivotal role in driving the group's adventures and resolving conflicts with her optimism and ingenuity.