Glenn Quagmire (seasons 8-17)

Glenn Quagmire is a recurring character in the FOX adult animated comedy series Family Guy. He is the neighbor of the Griffins, who is known for crazing over sex 24/7.

Bad Qualities

 * 1) He went from a kind of pervy ladies man, to a repulsive sexual predator who knowingly and gleefully shares his numerous STD's with the women he sleeps with (lying about wearing protection if he needs to), making him extremely unsympathetic to the audience despite how many times the show tries to give him sympathetic episodes (his sister being in an abusive relationship, him being tricked into marrying a prostitute, him being trapped in an abusive relationship with a "female Quagmire", etc.)
 * 2) He can be seen hitting on Lois Griffin constantly.
 * 3) Ironically, he says he likes women for their bodies rather than their personality.
 * 4) Glenn Quagmire isn't just a pervert, but a child molester.
 * 5) He's overly talkative, especially when it comes to sex.
 * 6) He abused Brian Griffin three times throughout the series, the first scene was when he severely beat up Brian Griffin, which is animal abuse, the second scene was when he broke Brian’s teeth with a lamp (Although, the second time was justified since Brian scammed him into buying a run-down lot, despite that Quagmire helped Brian get his teeth repaired in the beginning.), the third time is where he grabs Brian by the neck and bashes his head at the sprinkler, but after that, they soon apologized to each other, so it’s probably unlikely that they are gonna fight again.
 * 7) Speaking of which, he's a massive hypocrite in calling out Brian. It's implied that the real reason he hates Brian is that he's a dog, and Quagmire is a cat person. However, it was proven to be false because the true reason why he hates Brian isn't the fact that he's a dog. The true reason is that he doesn't like Brian's selfish personality.

Good Qualities

 * 1) Despite hitting on Lois, Quagmire is very loyal to his best friend Peter as he would never try to hurt his feelings by stealing Lois from him.
 * 2) He is still even likable in many episodes.
 * 3) His design can be funny.
 * 4) Spawned a lot of memes.
 * 5) Although he developed a hatred against Brian, this was not the case during Seasons 1-6. But then the fans of hated on Brian, which may be the reason the writers decided to make Quagmire hate Brian, but in the recent episode “Cat Fight”, he might have stopped hating Brian.
 * 6) He still cares about his family and friends. For instance, he defended Brenda from Jeffrey.
 * 7) At least he didn't gloat over the death of Brian in the episode "Life of Brian".