Ruby is a young woman with long black hair that she wears in two high ponytails, tied with rope. Her bangs are full and rounded such that they frame her face. Her eyes are large and wide, with visible eyelashes on her upper eyelid. Her eyebrows are hidden by her bangs but appear quite thin. She also has full lips that tend to be in a pouting shape.
Her outfit consists of a short, turquoise-blue dress with a ragged hem. It has no sleeves and is instead held up by a relatively thick piece of rope, tied at the front but leaving a gap for her cleavage.
Ruby's main interests are food and finding a man could provide for her. She has the most practical desire out of the three sisters, as the other two prefer superficial features in men. Thus, she is the most interested in getting to know Senku because of the ramen he introduced to the village.
Abilities and Skills
- Iron Forge Pumping: Ruby endeavours to pump a ton of oxygen into the iron forge as Senku seems to be the sort of man she's into, and his supposed type involves being good at it.
She is first seen along with her two sisters discussing the outsider, Senku. She doesn't comment herself, but listens to the other two as she soaks in the lake. They're later shown vaguely discussing love, lounging on a set of rocks in their bikinis while Suika listens in on them.
When Senku made the ramen, Ruby was lured to the cart by the scent. She flirts with him, asking if he's the one who made the food and what type of girls he's into. Senku replies "girls who can pump tons of oxygen into an iron forge". As such, she helps with the pumping. Soon, a storm arrives and Ruby runs off for shelter along with the other villagers who were working the forge. She then helps with the forge again to get the generator built, and is shown lying face down in the ground, exhausted.
In the fight between Argo and Ginro, Ruby shrieks with horror at how beaten up Ginro looked following one of Argo's barrages of hits. She then appears disgusted alongside her sisters when Ginro tells everyone his plans to have everyone have a harem.
When Senku makes cotton candy, Ruby is shown trying some and sobbing tears of joy at how delicious it is. After Senku asks Gen about Homura, Ruby and the others assume he's interested in a girl. However, Senku reveals Homura is spying on them.
On Christmas, Ruby is amazed at the beauty of the large tree Senku lit up with light bulbs. Later, when everyone is looking for special rocks for Senku to use as a better filament, Ruby holds something up and comments it looks like a gemstone. As it turns out it was just a beetle husk.
- She is named after the gemstone, ruby. The most common form of the gemstone is the pinkish-red shade, which Ruby's eye colour mimics.
|Male||Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Soyuz • Tetsuken • Titan • Unmo|
|Female||Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise|
|Unknown||Chalk • Sagara|
|Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Tetsuken • Titan • Unmo|
|Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise|
|Soyuz's father • Ibara • Matsukaze • Mozu • Oarashi • Soyuz|
|Amaryllis • Kirisame|