Ruby is the polar opposite of their best friend Lapis. They're carefree and cheerful, not to mention they can't hold a grudge. They don't do well getting yelled at, and they'll likely burst into tears if the yelling is harsh enough. They have a rather loud, high-pitched, cackling laugh that's slightly unnerving. They carry around a prop knife since they like to startle people. They're romantically interested in a boy named Carmeleon. They're also friends with someone named Emerald.