Kaya is a young adult woman who has blue eyes, a checkered red jacket, gold jewelry, bare midriff, and long blonde hair. She is part of a group of timetraveling scientists named The Tuners, led by her best friend Ein. and works alongside another friend of hers, Noah, and her husband, Ryugo. She is kindhearted, caring, loving, flashy, flirty, and a little short tempered, but she always knows what she's doing and makes sure her friends and colleagues are safe and happy. Ein and Noah are females.