I think they are good. The Martian Manhunter comics usually offer interesting adventures and explore his unique powers and personality. However, like any comic, it might not be for everyone.
I think it's quite good. The storylines are engaging, and the art is often top-notch. However, it might not be for everyone as it can get a bit complex at times.
A fanfiction could explore a scenario where Martian Manhunter is sent to Amity Park to investigate some strange paranormal activities that Danny Phantom has been dealing with. This could lead to an interesting dynamic as they both try to figure out what's going on while also learning about each other's abilities.
Well, it's difficult to say whether there is such a fanfic. Fanfic writers come up with all sorts of creative ideas, but this particular combination of Martian Manhunter and M Gahn in a pregnancy - related story might not be very common. There are so many different fanfic universes and themes out there. It could be that someone has written it, but it might also be that no one has thought of it yet or it's just not popular enough to be easily found.
One possible plot is that Martian Manhunter discovers Meghan's pregnancy has some sort of alien connection. He then has to figure out how to deal with this while also keeping her and the unborn baby from being used in some sort of intergalactic experiment. He might enlist the help of other superheroes he knows to ensure their safety.
It could be some alien species that are jealous of the special child Meghan is carrying. They might see it as a threat to their own existence or power in the universe.
They could start off being cautious of each other. Danny might be a bit wary of the Martian Manhunter's powerful telepathic abilities, while Martian Manhunter could be intrigued by Danny's unique ghostly powers. Eventually, they would realize they can work together well.
Their superhero friends would probably be very supportive. They would offer help in various ways, like setting up a secure place for the baby or providing protection. For example, Superman might offer his Fortress of Solitude as a potential safe haven if needed.
It could be about how they deal with the unexpected pregnancy. Maybe they face challenges from their respective communities or families. Or it could explore the unique biology of Martian Manhunter in relation to the pregnancy if he is the one carrying the child.