Bendy (Foster's Home for Imaginary Friends)

Bendy is a one-time character from Foster's Home for Imaginary Friends, who appears in the infamous episode, Everyone Knows It's Bendy as the titular main antagonist. He is the imaginary friend of a boy named Gregory who was sent to Foster's because of his troublemaking.

Why Everyone Knows He Sucks

 * 1) For obvious starters, he causes trouble all over Foster's. He is characterized as a troublemaker who wants to put everybody through hell and ALWAYS succeeds at doing so.
 * 2) His characterization is really flat and one-dimensional. He gets Blooregard Q. Kazoo, Coco, Wilt, and Eduardo in trouble for no explainable reason. Though to be fair, this is also the result of bad writing on the episode he appears in, and the fact that a lot of important scenes were cut said episode, presumably due to time constraints doesn't help.
 * 3) He made Frankie and Mr. Herriman unlikable jerks by making them take his side over the guys at Foster's with his made-up sob stories, making them both additionally out-of-character.
 * 4) *Worse still, his acting skills of making up sob stories is very poor and unconvincing, so much to the point that each time Frankie and Mr. Herriman fall for it, it makes the two look like complete idiots.
 * 5) Whenever he is about to cause a misdeed, or most infamously, gets anyone in trouble and gets off scot-free after that, he makes an evil and downright cruel grin. This is, without a doubt, one of the most infamous reasons why fans despised this character, and even worse, Bendy grins right at the character he just framed.
 * 6) Near the middle of the episode, Bendy acts very mean-spirited to Blooregard Q. Kazoo; the worst example is during the intercom after the poor blue guy gets banned from doing his favorite things until further notice. He uses Blooregard's toothbrush to clean the toilet, which is outright disgusting.
 * 7) His voice is very horrible, whiny, and ear-piercing, such as the annoying scene where he and Blooregard Q. Kazoo tried making a louder laugh at each other, and every time he fakes cries in front of both Frankie and Mr. Herriman to be spared from any punishment whatsoever.
 * 8) He never gets punished for framing the Imaginary Friends at Foster's out of malice and gets off scot-free at the end, which makes him a Karma Houdini.
 * 9) While his design is decent, it looks like a rejected design for The Grinch.

Redeeming Qualities

 * 1) He did get initially scolded and blamed for flooding the house, which is perfect Karma until Blooregard Q. Kazoo ruined it.
 * 2) He thankfully only appeared in one episode and never appeared again.
 * 3) Despite WENHS#8; he has a decent design.

Reception
Whenever Bendy is about to frame an imaginary friend and gets off scot-free after framing said imaginary friend, he makes a very slimy, evil, and downright cruel grin; that in particular has been widely criticized by fans for being horribly obnoxious, especially when he does this to a certain favorite character of fans. Due to this, following the episode he appeared in, he was completely removed from the show. Lauren Faust apologized to fans for making Everyone Knows It's Bendy.

He, Jamze Withazee and Goofball are considered to be three of the most hated characters in the show, even surpassing both Blooregard Q. Kazoo and Duchess combined.

Trivia

 * He is the first character in Foster's Home for Imaginary Friends to be written out of the show, and is classified as a 100% non-canon character. The second and third characters are Goofball McGee and Jamze Withazee in that order.
 * Despite not appearing in any other episode of the show, Bendy's signature was seen on Mac's 'Goodbye' card in the series finale of Fosters Home for Imaginary Friends, "Goodbye to Bloo", though it might be another character who's also named Bendy.
 * Because Bendy was not seen again after the episode "Everyone Knows It's Bendy", it is highly possible that Bendy might have been caught for his misdeeds and got kicked out of Fosters off-screen.