One can anticipate some epic battles or challenges. Maybe they have to rescue a group of people trapped by a powerful sorcerer. During this, Thor would use his hammer and lightning powers, while Donald would use his wits and whatever resources he can find in his rather strange world. Their combined efforts would be a sight to behold.
They might start with some mutual suspicion. Percy would be cautious around Thor as he's a very powerful being from a different mythology. Thor might see Percy as a bit of an oddity at first. But then they could start to exchange stories about their adventures. Percy could tell Thor about his battles with the Titans, and Thor could share his tales of fighting giants. This would lead to a newfound respect between them.
One key element is the cultural clash. Nico comes from a different mythological background compared to Thor. Their different beliefs, powers, and ways of doing things often lead to interesting situations in the story.
Well, perhaps Percy would initially mistake Thor for a new kind of demigod. Thor, on the other hand, would be intrigued by Percy's unique skills. They could exchange stories about their adventures. Percy would tell Thor about his quests in the Greek world, and Thor would share his tales of Asgard. And in the end, they might become friends and even learn new combat techniques from each other.
Richard could be an ordinary human being. Just a regular guy going about his daily life until he has an unexpected encounter with Thor. Maybe he works in a coffee shop and Thor stumbles in while chasing a villain.
Well, perhaps Thor and Richard could meet in a modern city. Thor is on a mission to retrieve a powerful artifact that has been smuggled into the human world. Richard, who is an expert in ancient relics, unknowingly has the key to finding this artifact. Their meeting could start with Thor saving Richard from some thugs who are after the same artifact. And then they team up to find the item before it falls into the wrong hands.
It could be an amazing story where Thor's Asgardian strength and power meet Donald's rather comical and often bumbling nature. Maybe they team up to face a common enemy, like a villain who has invaded both their worlds.