Name: Lissie Okane
Age: 17
Looks:

Personality: Sweet on the outside but crazy on the inside (like most Kakegurui characters)
Likes: Money, winning and bullying house pets
Dislikes: losing

Backstory: The Okane family, well known for arm dealing (selling weapons). Lissie is the oldest of the 4 children and the next head of the family.