Jude was a member of the Children's League and a Yellow.
As a child, Jude was abused by his parents and was often locked in closets and small spaces resulting in his claustrophobia and anxiety. His father would become angrier if he was in view so to prevent that his mother would put him in the closet.
Jude was on Ruby's team with Vida and Nico during their time together in the children's League. His code name for missions was "Sunshine", which was appropriate due to him being a Yellow and his bright, cheerful personality.
Jude does not pay attention to Ruby's wishes to be left alone and slowly worms his way into her love with his determination. He is very caring and trusting and seems very naïve to Vida and Ruby. Jude tells Ruby that he doesn't just want to know about someone, but that he wants to know the whole person: “I don’t want to just see someone’s face; I want to know his shadow, too.” (Bracken 100).
Jude is first introduced when Ruby arrives at the Children's League's Los Angeles HQ for the first time. Ruby is told that he is on her team along with Vida and Nico. Jude is not deterred by Ruby's constant "just leave me alone" attitude and eventually she becomes very protective of him. They call him their "one-man welcoming committee" because is always the only person there to give them hugs when Vida and ruby come back from ops.
When Cole secretly orders Ruby to find Liam and the flash drive containing research on IAAN's cure, she is particularly upset that Jude is also assigned the same mission because she knows it will be difficult to both find Liam and protect Jude. With her help, Jude realizes that Rob and the other corrupt agents sent him, an underage Psi, on a dangerous mission.
Though Jude finally sees how harsh the outside world can be, he retains his sunny demeanor and continues to be a lovable cheery kid. He uses his Yellow abilities several times to help get things done and proves to be much better at controlling them than Ruby gave him credit for. Jude plays a large role in escaping PSFs, getting supplies to save Liam, and keeping up team morale.
At the end of the book, while trying to escape a collapsing HQ, Jude is crushed under the structure, and slowly suffocates. When Liam and Chubs go back down into the tunnels to try and find him, the only thing they bring back up to the surface is his compass (given by Alban on his first day) that he always wore around his neck.
Jude has maintained a bright outlook on life and believes people are good-natured and was known for being an optimist. He is very naïve to how harsh the world has become which is why Ruby feels the need to protect him as he cannot protect himself. He is incredibly kind and has a huge heart. He is a very wholesome, youthful boy who always tries to find the best in people.
Jude is described as having a mop of red-brown hair, freckles on his nose and big brown eyes. He's incredibly skinny and tall and has been called "Beanpole" several times in the series.
Nico was Jude's best friend and they often spent time together. (And they were roommates)
He always welcomes Ruby when she comes back from an op. She acts cold at first not wanting to get close in case she happened to lose him. Their friendship develops as the story progresses and they become very close. Ruby takes on almost a parental role to Jude. Then he dies.
Their friendship starts early. Then they start to work together. As the story progresses they become very close. Vida likes to playfully tease Jude.
Jude immediately likes Liam and looks up to him. They discuss bands and movies on the way back to California. And I think they played cards once or twice