Name: Tsuki Yagami (夜神 月)
Alias: Amaya Miyazaki
D.O.B: January 28th
Age: 17-25
Hair color: Tsuki has long waist-length silver hair.
Eye color: Tsuki's eyes are reddish-brown like her cousin's but when she gets really angry, they can turn red.
Appearance: Tsuki usually wears gothic Lolita styled clothing. Around her neck is a cross choker and she always has her hair pulled back in a black headband.
Human or Shinigami: Human
Do they have a death note: Yes
Shinigami: Kokami aka Kō
Shinigami Description: Kokami has gold eyes, a lean figure with black wings and dresses in black. He has a chain necklace and a side pouch by his wing to hold his death note. Kokami has a love for pears instead of apples. He is also very perverted.
Shinigami eyes: No.
Anti-Kira or Pro-Kira: Anti
Part of the Investigation: Yes
What brings them to Japan: Tsuki was born in Shinjuku-ku, Japan but at the age of 5, she moved to America. During her stay in America, Tsuki became a delinquent and part of a gang by age 9. When her mother, Maika, tried to get her out of the gang, the gang vowed that they would make Tsuki pay. Tsuki was forced to watch as they beat down Maika and since then Tsuki has hated gangs. She soon kept up with her academics and martial arts training. She has trained up to the point that she can feel no pain but she suffers emotional turmoil. By the age of 17, her father was fed up with her rebellionous attitude and sent her back to Japan for college. She attended To-Oh University where she met her cousin, Light.
She met Kokami when she found his Death Note in a back alley. With it, she killed the American gangsters that killed her mom and later found it to be the very weapon KIRA used. She therefore spends her time torturing Light and finding evidence to convict him. Her personality is that she's random, hyper and insane. She adores apples and she is a complete sadist[shown when torturing Light] She has a love/hate relationship with Light and often mocks the Yagami name and teases him. However, Tsuki has a strong sense of justice and will always do the right thing. She is Light's older cousin and she considers him her "rival". She however, treats Misa like a sister for the two have similar tastes in clothes.