|Sheen Juarrera Estevez|
|Relationship||Libby (Jimmy Neutron: Boy Genius)|
Aseefa (Planet Sheen)
|Family||Mr. Estevez (father)|
|Friends||Jimmy, Carl, Ike, Grellmen (Jimmy Neutron) Doppy, Emperor, Mr. Nesmith, Pinter, Dorkus Aurelius(Planet Sheen)|
|Likes||Libby, Ultra Lord, Aseefa|
|Dislikes||Cindy, Grellmen, Princess OomLout, Having his Ultra Lord figures being called "dolls"., Grish|
Sheen Juarrera Estevez is one of Jimmy Neutron's closest best friends and one of the main protagonists in the television series. Sheen's overactive obsession with Ultra Lord is one of the running gags in the series. He is shown to have many Ultra Lord action figures, and knows a lot of the trivia from the show. His love for the superhero was noted in the movie, and was carried on throughout the course of the series. He is voiced by actor and comedian, Jeff Garcia. Sheen is actually smart, he is easily distracted.
He managed to answer the math problem 7 × 7 in the episode "Sheen's Brain".
Sheen is not the brightest bulb on the Christmas tree. Sheen is obsessed with the Ultra Lord action hero. He collects all the Ultra Lord action figures, cards, and quotes him daily. Sheen is 14 years old (he got held back a few times.)
Sheen is intelligant and his antagonism does not excuse him at all, including annoyance.
- In Nightmare in Retroville, when Jimmy Neutron uses a machine to transform him into a werewolf, but he ran away to bite Libby Folfax (despite being she was a vegetarian).
- In Sheen's Brain, when Jimmy Neutron upgrades his Brain Drain Helmet to a Brain Gain Helmet to make him smarter. His brain expands to huge size and now he gains telekinetic powers to destroy Retroville.
- In I Dream of Jimmy, he is in Carl's dream as the Ultra Principal.
His romantic interest is Libby Folfax, and his interest in her became highly noticeable towards the end of the first season of the series, but in the new spin-off series Planet Sheen, he has a new romantic interest: a blue alien named Aseefa.
Sheen is a turbocharged, hyperactive child with an attention span of 0.4 seconds. His best friend back home is boy genius Jimmy Neutron. He's got a passion for life, TV, guacamole, and a superhero called Ultra Lord. He isn't the best student, but what he lacks in common sense and focus, he makes up for in burning curiosity and loads of energy. One day, disobeying Jimmy's specific instructions ("Sheen, Do Not Touch This Rocket!"), Sheen touches a rocket and goes flying into deep space. He lands on a strange planet called Zeenu, where the grand leader thinks that Sheen is destined to bring peace, prosperity, and eternal joy. After the Emperor promotes Sheen to be his number one Royal Advisor, Sheen gets to do virtually whatever he likes, such as battling man-eating creatures and throwing wild parties. Even when the evil villain Dorkus tries to destroy him, Sheen's crazy ways almost always save the day. He doesn't seem at all worried about whether he'll get back to Earth or not.
Nicknames: He is sometimes called the chosen one, Ultrason by his dad in the movie, and Ultradork by nick, or Cindy. He can be called annoying Doofus by Carl(Only in "Sheens Brain") as well as Pickle Chin Ahh Boy.
In "Operation: Rescue Jet Fusion", Sheen states that he is Mexican.
In The Adventures of Jimmy Neutron: Boy Genius, Sheen has peach skin. He wears a turquoise Ultra Lord T shirt and black pants. He has short black hair that is usually spiked and is usually shown wearing a pair of turquoise-and-white sneakers and always wears red or purple Ultra Lord underwear He also has a pair of white eyes with black pupils.
In Planet Sheen, Sheen does not wear his trademark Ultra Lord t-shirt. (Although he did wear his normal clothes throughout the first episode.) Instead, he wears a mint green jacket (with a Zeenu insignia on his right chest), navy blue pants, navy blue boots, and a black belt with a silver buckle.
Sheen served as a Sergeant in World War Two, and he is responsible for leading troops to Iwo Jima. However, he suffers from Post Traumatic Stress Disorder throughout The Adventures of Jimmy Neutron: Boy Genius as well as Planet Sheen.
Sheen's religion is Hindu, and he speaks 5 languages: English, Spanish, Russian, Vietnamese, and French.
Sheen may have ties to the Sicilian Mafia.
Sheen's eyes are normally brown but in some mistakes, in The Fairly OddParents his eyes turn indigo, in the next TV series come up, his eyes are black.
- he is the peak of human intelligence and strength
- he helped jimmy in looking at carls humongous ass
- he was the midwife when carl had children
- he is the hottest man alive apart from carl wheezer
- he is god