Jimmy is one of the cul-de-sac kids from Ed, Edd n Eddy. He is an insecure child with a propensity to cry. Sadly, he was flanderized from seasons 2-6.
Why He Was a Tattletale with a Big Mouth
He started out as a nice cute child but eventually became a vengeful crybaby tattletale.
He was way too accident-prone to be relatable. A good example is in "Cry Ed": he thinks that he was injured when a clothespin gently tapped his foot.
He didn't face any consequences for some of his bad actions. Instead, he got rewarded by Sarah for telling lies about the Eds.
He was extremely unlikable in certain episodes such as "If It Smells Like an Ed", "Ed in a Halfshell", and "Tinker Ed" because of how he got revenge on the Eds or tattled on them to Sarah so he could happily watch her have them beat-up again for his own amusement.
He would collectively punish all three of the Eds. Even if one or two of them did something wrong to him, he would still punish all three of them anyway.
One example is that he punished the Eds in a dumpster jail at the end of "Look Before You Ed" for ruining the safety club. It would have been justified if he had only trapped Ed and Eddy since Edd did nothing wrong throughout the episode.
His higher-pitched voice can get pretty annoying and grating quickly.
He is very immature for a 9-year-old as he frequently acts like a little toddler and cries way too much whenever he does not get his way
Speaking of the episode "Tinker Ed" he wished that the Eds would get beaten and killed by Sarah who threatened to strip them of their will to live by turning them into dog-meat and even makes her take a photo of the Eds in fairy tale costumes in order to prove Kevin that fairy tales are real by committing blackmail. When in reality, is against the law to be wishing somebody dead through bodily harm and for committing blackmail making Jimmy an accessory to Sarah's crimes as her accomplice.
His dislike for the Eds was still pretty understandable since they would try to scam him for his money and hurt his feelings.
Also, in "Every Which Way But Ed", it was revealed that thanks to the Eds (well, Eddy mostly) through their ominous scam, Jimmy got his signature retainers when he bit on a bowling pin when he thought it was a cream horn, severely damaging his teeth.
He did get punished at times, making him less of a karma houdini than Kevin (only when he’s at his worst) and Sarah, and as such, he was generally not as loathsome as Kevin (again, only at his worst), Lee, and especially Sarah.
Some of the kids, such as Eddy and Kevin, were mean towards Jimmy, so it balances out.
Overall, he’s not a bad character at all, just flawed.
Heck, similarly to Kevin, most Ed Edd n Eddy fans still like him.