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. Onomatopoeia 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.