niko-niko（ニコニコ）
niko-niko describes a state of smiling cheerfully and continuously.
hera-hera（ヘラヘラ）
hera-hera describes a person acting in a frivolous, unserious, or overly casual manner, often smiling or laughing without sincerity.
boro-boro（ボロボロ）
boro-boro describes a state of being worn-out, tattered, or falling apart.
pera（ペラ）
pera describes something thin, light, and flimsy moving or bending easily, often with a soft flipping or fluttering motion.
hoka-hoka（ホカホカ）
hoka-hoka describes warm, freshly heated conditions, typically referring to food, air, or objects that retain gentle warmth.
kara-kara（カラカラ）
kara-kara describes a light, dry rattling sound produced by small or hollow objects moving or shaking.
zawa-zawa（ザワザワ）
1. Low, continuous murmuring or ambient noise
zaku-zaku（ザクザク）
1. A crunchy, cutting, or digging sound
biri-biri（ビリビリ）
1. Continuous electric stimulation or tingling
niya-niya（ニヤニヤ）
niya-niya describes a sly, smug, or suggestive grin that continues over time.