Ruby

According to the official website, Ruby is depicted as polite and tidy who loves to watch the cherry blossoms bloom.

In Jewelpet, Ruby is very air-headed, joyful, brash, happy and a big troublemaker, who sometimes wants to go her own way, despite being told to stop at one place. She also acts like a little sister to her partner Rinko Kougyoku, but sometimes has a hard time handling her antics. Despite all of this, she and Rinko always settle their differences and help each other out.

In Jewelpet Twinkle☆, Ruby is a supportive type for the series' human protagonist, Akari Sakura. She is a curious and cheerful character who thinks positively. She also acts as Labra's older sister. Even when in the harshest of situations, Ruby would do anything to help Akari and never leave her alone. Unlike the first and later series, she has a really kind and sweet personality, contrasting her dumb and airheaded characteristic.

In Jewelpet Sunshine, Ruby is very air-headed, joyful, brash, happy and a big troublemaker but with a bit of an edge to her because of her difficult relationship with Kanon, much like her series’ original counterpart, She is also rather straightforward and snarky with her opinions, and can also be quite greedy, most of the time, but she truly cares about Kanon, no matter what they think about each other, She will usually fight with her over Kanon’s crush (later, revealed to be brother), Mikage, however later down the line, after the final battle between Dark Jewelina, Kanon and Ruby stopped arguing and got along with each other.

In Jewelpet Kira☆Deco!, Ruby owns the Kira-Kira Shop where she keeps all her prized jewels, and also where she lets Pink stay in while acquiring the Deco Stones. She is very happy-go-lucky but dimwitted who loves sparkly things, such as Saury, a type of fish, and jewel stones. Ruby represents Lucky in this series, and her magic isn't very good.

In Jewelpet Happiness, Ruby is outgoing and a happy-go-lucky Jewelpet who helps out at the Jewelpet Café Happiness along with the other employees.

In Lady Jewelpet, Ruby is very air-headed and doesn't really know how to teach Momona the right things. She can't tell when someone is insulting her and takes it as a compliment instead. When in a panic, she does things on impulse and often hurries off to do what she has to do. However, Ruby still manages to be very optimistic, and also a loyal friend.

In Jewelpet Attack Chance!?, Ruby has a lazy attitude who doesn't like to get things done. She also has a huge appetite for food than she does in the first series.