These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Darkwing Duck
Alas, Poor Villain: In the 2011 Darkwing Annual, we discover Quackerjack enjoyed his work in Quackwerks Toy Department, at least at first. Eventually the pressure and paranoia started to get to him, and he...well, snapped. At the end of the comic, after a long and extremely strange battle between the old and new Mr. Banana Brain, he goes back to his girlfriend, Claire's, house. He looks longingly at the door for a while, then sighs, and pulls out a miniature version of the device he had been using, which turned people into toys. We see a flash from inside the house, and Claire rushes out to find a sad, little Quackerjack doll, with a little note leaning against it. It reads "This is the best I'll ever be. -Jacky"
Angst? What Angst?: Gosalyn is quite chipper for a little kid whose granddad was murdered in the first episode.
Even weirder in issue #4 of the comic book when everyone confronts Taurus Bulba and she doesn't even mention her grandpa's death, only that Bulba kidnapped her for the code to his Ramrod machine. You'd think it might come up.
To be fair, she might not know as Taurus's goon did in her grandfather, and she might not know they were working for him.
NegaDuck qualifies as well when he's in the mood. Despite much of his personality being played for laughs, he is still taken seriously by the other characters, putting him in this trope. In "Just Us Justice Ducks":
NegaDuck: Don't move! If I push this button, the electric wall will close in and destroy St. Canard!
The Justice Ducks: *GASP!*
NegaDuck: In fact, I think I'll just push it anyway!
And then there's the fact just finding out that Negaduck was the guardian of his universe's Gosalyn convinced Darkwing to stay and free his world. Speaks volumes as to how evil this guy is doesn't it?
"I have a better memory than most people think... and I know a hero when I see one."
"You were always my Superhero."
"Rest your head, little girl blue, come paint your dreams on your pillow. I'll be near to chase away fear, so sleep now and dream till tomorrow." (All of Darkwing and Gosalyn getting to know each other in the first story, really, but it's hard to call that a moment.)
There are a few good moments in Life, the Negaverse and Everything. When Darkwing realizes that the Good Gosalyn's ward is Negaduck, he decides to stay in the awful reality for her sake. And then at the end of the episode, after defeating Negaduck with the help of the Friendly Four (dressed in Darkwing Gear) and is about to head home, he asks if Gosalyn will be alright. Her response? "I have four Darkwings to take care of me now!" All while the good incarnations of his worst enemies merrily wave goodbye. Aaaaw.
Megavolt has a few followers; he was beaten badly in high school, constantly gets beat up, and has a personality that makes you feel somewhat sorry for the guy, when he's possibly committed murder.
Ensemble Dark Horse: Megavolt was one of the most popular characters of the show. It's no wonder why he was in more episodes than any other villain.
Liquidator was far, far more popular than his episode count (one solo appearance) would suggest. Of course that's part of why he was selected for the Fearsome Five.
Darkwarrior Duck. When he appeared in the comics, people got really excited. And there're major hints that he'll has a main role in near future, which itself is something to gushing about.
Quackerjack in the comic, probably the most developed villain next to Nega-Duck.
Evil Is Sexy: Morgana and Neptunia before their Heel Face Turn, and the Bugmaster a.k.a. news reporter Bianca Beakley.
Yes, and mixing this trope with a Love Potion is a disturbing combination...
On a less 'mortal enemies' note, Darkwing and Grizlicoff have some of this.
Darkwing and Neptunia had some of this in her debut episode when she kisses him on the cheek at the end.
Also Darkwing and Isis "Icy" Vanderchill.
Fridge Logic: That Splatter Pheonix wasn't very freaked out at being melted into a puddle by turpentine suggest she was aware that she's a cartoon character.
Fridge Horror: The fact that Negaduck is the guardian of his universe's Gosalyn. In-universe as well, just considering that idea was more than enough to convince Darkwing to stay and free that world. It's honestly Fridge Horror imagining what Darkwing was thinking!
In an early episode a passing joke is made where a now rich Darkwing has Incorporated himself to protect the city. Silly until recently when a back from the dead Batman decides to do the same thing!
Ho Yay: DW and Launchpad. Search your feelings, you know it to be true.
Quackerjack and Megavolt too.
Liquidator and Bushroot, though not quite as common as Quackerjack and Megavolt.
Jerkass Woobie: Because of his power to generate electricity from himself, Megavolt was sometimes considered less than human (er, less than a rat, or a mole, or....well, you get the idea). One comic story in the Disney Adventures magazine I remember recounted various criminal organizations trying to capture Megavolt and treating him as a slave. One of the gangsters even ominously told Megavolt that he planned on "converting his energy."
In his first apperance in the pilot, we see he's been operating his criminal ring from inside prison for some time, even using the license plate making area to turn part of the prison into an airship ready for his escape. He has his men kill Gosalyn's grandpa, making it look like an accident, finds Darkwing's secret hideout, and nearly kills both Gosalyn and Darkwing.
Believed to be killed in an explosion, he appears again in the third season, body badly damaged, and life saved by F.O.W.L. turning him into a cyborg. They hope he will become one of their chief agents...he thanks them for saving him by blowing up thier base, and proclaiming he works for no one. Later in this episode he takes Gosalyn hostage, and when D.W. offer to do whatever he wants in exchange for her freedom, Bulba laughs and says he doesn't know what he wants yet...just for the fun of watching Darkwing squirm.
His next canon appearence was in the new comics series, when his cyborg body had an accident and he took on a Ghost in the Machine persona, creating Quackwerks, and using the corporation to take over the city in under a year..why? For revenge? No...just so he could gather every citizen, get them to say every word they know until he came across the activation word for the Gizmoduck suit.
Gosalyn: "So Quackworks taking over St. Canard was just a ruse to..."
Darkwing: "..net Bulba the Gizmoduck suit. Just to show he could!! We've all been trapped in another man's game."
Memetic Mutation: I am X, that Y (Ex.: "I am a can of tuna that has been expired!")
"Put out the Darkwing, put out the Darkwing!"
Nightmare Fuel: Sometimes when SHUSH asked Darkwing to take over a case for them they showed him what happened to the guys they had who were looking into it before. Like once Darkwing asked what happened to their last agent and J. Gander replied by taking a can of cat food out of his desk drawer.
Actually, the cat food was just cat food. The other cat food can in Hooter's desk was the remains of their last agent.
Paddywhack. Monster Clown, feeds on negative emotions, beak filled with sharp teeth, evil beady eyes, spider-like limbs on a squat body, that deep scary voice... GAH!. He's the Darkwing-verse version of It. Issue #7 brings him back. And now..Paddywhack is coming to supper!
Slightly undercut by Quiverwing Darkwing, who also lost his Goslyn, and took up her Quiverwing Quack hero persona to honor her. He later beats Dark Warrior Duck.
The Woobie: Gosalyn, very effectively, in "Darkly Dawns the Duck", while she's still an orphan that feels unwanted. In later episodes she doesn't have that problem, and characterization in general is more shallow anyway.