As her components' forms and gemstones are the same (excluding the gemstone that is located where her left pupil would be instead of where her entire left eye would be), she remains identical, except for being larger in size and having a slight outfit variation (including Doc's yellow visor). Her gemstones are located on her chest, where her left pupil would be, navel, left shoulder, and left thigh.
In, "Hit the Diamond", she threateningly asks for the location of Jasper in a firm and interrogative tone, which matches Doc, Eyeball, and Army's personalities. However, once given an answer, her voice became higher and happier (a complete mood swing), which matches Navy and Leggy's personalities. In "Back to the Moon", she tells Garnet, Amethyst, and Pearl that they "can't trick them again." After Steven opens the airlock, Giant Ruby holds onto the doorframe to keep from being swept out, telling Steven that he "can't get rid of them that easy."
She does not identify as her own being, saying "tell us where Jasper is now," "we won't let you trick us again," and "you can't get rid of us that easy."
After learning they have been tricked, the Rubies fuse to form Giant Ruby. Peridot then runs out of the barn and attempts to surrender herself in exchange for the safety of her friends. Giant Ruby, much to Peridot's surprise, asks where Jasper is. Peridot is unable to answer so Steven covers for her and tells Giant Ruby that Jasper is on the planet Neptune. Giant Ruby, seemingly appeased, unfuses.
After the Rubies realize they have been tricked again, Doc orders them to assemble and they fuse into Giant Ruby to fight the Crystal Gems. Steven opens the airlock and the vacuum of space sucks Giant Ruby halfway out the door. Giant Ruby tells Steven that he "can't get rid of them that easy." They both turn and watch as Sardonyx forms. She smashes her hammer into Giant Ruby, forcing her to unfuse, separating the Rubies as they are sucked out into space.
In "Hit the Diamond", after the Crystal Gems trick her components into playing a game of baseball to stall their chances of finding Jasper, she is formed and is extremely angry. She is formed again in "Back to the Moon", determined to get revenge on the Crystal Gems for tricking her components again.
Giant Ruby's five gemstones are located on her chest (Doc), where her left pupil would be (Eyeball), navel (Navy), left shoulder (Army), and left thigh (Leggy), corresponding with her components' gemstone locations (excluding the gemstone that is located where her left pupil would be instead of where her entire left eye would be). Her red gemstones each have a square aspect, a symmetrical front and back, and a light pink ring around them, usually hidden inside her body. The gemstones are decahedrons, specifically truncated tetragonal dipyramids.