I like the one sidedness of their dynamic
Negaduck likes the Prime universe in the sense that he finds it a challenge. His universe is already pretty rotten, and while he finds it fun because he can treat it as a playground in some sort of way–eventually it gets boring. It's why he comes and goes in prime, he appears when he wants, does what he wants and then disappears.
It's interesting because I think a part of him keeps coming back because of Darkwing. (Just a heads up this is NOT negawing) Darkwing is really one of the only characters to put a stick in his wheels and get in the way of his plans, it's why Negaduck constantly has to think of new ways to approach St.Canard. Darkwing is a lot more important in his life than I think he likes to acknowledge.
I do not think Darkwing holds any attachment to Negaduck. He finds him as much of a hassle as he does any other villain in St.Canard. Additionally, I think he's removed himself from Negaduck completely. Darkwing knows they're not the same person (unless we're talking about the good looks they both claim to have). There's no special treatment with him.
When Gosalyn gets involved he obviously doesn't want her there and he'll tell her to go home, but it's nothing nearly as major as Taurus bulba. It gets to the point where Launchpad uses the Quiverwing Quack Episode to tell Darkwing that he's coddling Gosalyn too much. All that's to say, Darkwing doesn't care nearly as much as Nd.
Another thing I think is interesting is his constant attempts to kill Dw. He hates him, and I think a big part of that hate comes from the fact that Negaduck is a varient of Dw. They both have a need to be #1, and tbh I think the mere fact that Negaduck will never be an original, THE varient really annoys him, especially because the original goes against everything he stands for.
It's interesting how tunnel visioned he gets sometimes, how committed he is to offing the hero. Because of how much of a challenge Darkwing is for him, the greatest achievement of all would be to get rid of him entirely.
And he doesn't think that far ahead either because in the case that he does succeed, What then? He'll likely be as bored as he was in his own universe
It's interesting how negaduck relies on Darkwings whereas dw doesn't. There will ALWAYS be other bad guys, there won't be another darkwing.
