Ruby

Ruby is a member of the Crystal Gems who made her official debut in "Jail Break". Originally a Homeworld Gem soldier assigned to protect Sapphire during a mission on Earth, the two accidentally fused and were forced to flee to prevent Ruby from being shattered by Blue Diamond. Ruby later joined the Crystal Gems and remains together with Sapphire as their fusion, Garnet.

According to Rebecca Sugar, Ruby "has no sense of what's going on around her" and "can only focus on one thing only at the expense of all things".[​2] She appears to be a bad conversationalist, occasionally speaking in somewhat unintelligible mumbles, a trait which she carries onto Garnet. She is also seen to be bad at lying under pressure, giving the Rubies the idea to search the barn. Though Ruby can't focus on what's going on around her, she is thoughtful and introspective as seen in "The Question".