Pera Pera is a simple dictionary of japanese Mimetic and Onomatopoeic words used in daily life and manga.For those studying Japanese or reading manga Pera Pera is a useful resource to aide understanding.Onomatopeia are words which try to imitate sounds. For example: wan wan woof woof, nya meow.Mimetic are words used to describe the sound of an action or state. For example: goro goro rolling around, pera pera fluency.