Natsuko Hayashida designs under her own brand, Swallowtail Designs, but also designs for Okaycat Fonts. These are the fonts by Okaycat.

You can purchase them through myfonts.com.

Trees of Africa

Exchange Student

Okay Crayon

Shababa

Okay Cursive

Japanese Brush Master

LOLO Dingcats

LOLO Animals

LOLO City

Bapalopa

Okay Paint

Little Japan

Hive Mind

Giacinta