Sheen Estevez (Planet Sheen)

Sheen Juarrera Estevez is a major character from the Jimmy Neutron franchise and the tritagonist of Jimmy Neutron: Boy Genius and The Adventures of Jimmy Neutron: Boy Genius and the titular main protagonist of his spin-off show, Planet Sheen. Known for his obsession with the superhero Ultra Lord, he is one of Jimmy's best friends and Libby's boyfriend.

Sadly, he got badly flanderized in his own spin-off show.

Why He Was an Ultra-Dork
Note: This only applies to his character as depicted in Planet Sheen since the original Sheen Estevez is likable.
 * 1) First and foremost, he has been badly flanderized from a nerdy, hyperactive, wacky, dimwitted, and hilarious goofball, and has turned into a completely annoying, obnoxious, self-centered and immature idiot. He barely has any personality as well, and it resembles that of Jar Jar Binks.
 * 2) His humor and gags have gone from being actually funny and intelligent to being unfunny, stupid, and gross. It gets to the point that he overuses toilet humor in the worst way possible.
 * 3) He doesn't even have concern about returning to Earth throughout the series. In fact, he decides to stay on Zeenu in the series finale.
 * 4) * However, in "Tommorrow Boys", an episode from the original series, it's implied that he did return to Earth. However, only he could make that happen, so he could likely stay on Zeenu forever.
 * 5) He has completely forgotten about  Libby. Instead, he has become attracted to an alien named Aseefa, which means that he has cheated on her.
 * 6) Speaking of him being an idiot, there are many moments of him being unintelligent, to the point that it's not even funny and instead gets irritating, much like Patrick Star in seasons 6-8 of SpongeBob SquarePants:
 * 7) * He forgets everything he used to know in the original series. Instead, he makes downright stupid claims.
 * 8) * He keeps calling Nesmith a monkey, even though Nesmith keeps telling him that he's an ape.
 * 9) ** With this in mind, he never stops annoying him with that fact and in general.
 * 10) His arrogance and selfishness have been cranked up to eleven.
 * 11) * In particular, he frequently blames Nesmith for the mistakes and misdeeds he makes.
 * 12) * He keeps teasing Dorkus because of his name, which has the word "dork" in it.
 * 13) * Granted, while Sheen could be a bit of a jerk in the original series, he still cared about his friends. However, he was never that much of a jerk as he is in this spin-off.
 * 14) His voice in this series isn't that great compared to the original series. While Jeff Garcia usually does a good job voicing the character, here he does a poor job voicing him.
 * 15) Every time he mentions Uncle Miguel, we see an ugly closeup of his face.
 * 16) He never gets punished for any of the bad things he has done, nor does he get called out on it, which puts him into the Idiot Houdini category.
 * 17) His very own show most likely permanently killed the Jimmy Neutron franchise.
 * 18) * He, alongside Fanboy and Chum Chum, was responsible for the downfall of Nickelodeon.

Redeeming Qualities

 * 1) He was a better character in Jimmy Neutron and redeemed himself after his show ended. He was also decent in the pilot episode of his show.
 * 2) His voice actor, Jeff Garcia, does reprise his role in this series.
 * 3) He has some very funny moments on occasion:
 * 4) * In the pilot, he was a bit funny in a few parts, such as questioning about "J.N." (Jimmy Neutron) and asking where the bathroom was.
 * 5) * One of his lines, "I'm not a monkey", is actually pretty funny.
 * 6) His appearance hasn't changed at all from his Jimmy Neutron design, and as such, it's still identical to what he normally looks like.