pyon-pyon（ピョンピョン）
1. A light, bouncing or hopping movement
niko-niko（ニコニコ）
niko-niko describes a state of smiling cheerfully and continuously.
shiku-shiku（シクシク）
shiku-shiku describes a quiet, continuous expression of sadness or pain.
ton-ton（トントン）
1. Light tapping or knocking sound
yura（ユラ）
yura describes a gentle, slow, and continuous swaying motion.
fuka-fuka（フカフカ）
fuka-fuka describes a soft, springy, and cushion-like state, typically used when something has a plush, yielding surface that gently compresses under light pressure.
moko-moko（モコモコ）
moko-moko describes something that appears soft, fluffy, and thickly padded.
gera-gera（ゲラゲラ）
gera-gera describes loud, unrestrained laughter marked by a sharp, open sound.
gishi（ギシ）
gishi describes a light creaking sound produced when a surface or object slightly bends or shifts under pressure.
piri（ピリ）
piri describes a sharp, slight, and momentary reaction caused by a thin or pointed stimulus.