Their first encounter could be really intense. Hades might be sitting on his throne, all imposing, and Will would be a bit scared but also curious. Hades could use his powers to make the area around him seem even more menacing, like making the flames around his throne burn brighter.
Maybe Will stumbles into Hades' chamber while exploring the Underworld. Hades is initially angry at the intrusion but then becomes intrigued by Will. Will, on the other hand, is in awe of Hades' power and appearance. They start talking, with Hades asking Will who he is and what he's doing in his domain.
It could be that Will is brought before Hades as a prisoner. Hades looks down at him, sizing him up. Will tries to be brave and defies Hades at first. But then Hades starts to question Will in a more calm way, and Will realizes that Hades is not just a brute, but a complex being with his own motives and emotions.
Their first encounter could be very tense. Tobirama is a strict and powerful figure, and Naruto might be a bit intimidated at first. But Naruto's natural boldness would soon take over, and he would introduce himself. Tobirama would likely be curious about this strange - looking boy with so much chakra.
Their first encounter might be filled with tension. Youko Kurama, with his sharp senses, would immediately detect Kagome's unique spiritual power. Kagome, seeing a strange and powerful being like Youko Kurama, would be on guard. Maybe there would be a brief stand - off, with both sizing each other up.
It could be a formal encounter in the Oval Office. Hetalia America might be a bit nervous but tries to hide it with his bravado. He'd probably give a big smile and an overly enthusiastic handshake. The President, on the other hand, would be a bit taken aback by his energy but quickly regain composure and start the conversation in a diplomatic tone.
The first encounter could start with Red X spying on Young Justice. They notice him and think he's a threat. Red X, being the mysterious character he is, doesn't give much away. He might use his agility and gadgets to evade them at first, leading to a chase that ends with a stand - off where they exchange some sharp words.
It would probably be tense. Nico is used to a world of danger and is a bit of a loner. Umbridge's officious manner would likely put him on edge immediately. He might sense her underlying nastiness right away. He would probably be very guarded in his responses to her, not wanting to give away too much about himself.
The first encounter might be one of confusion. Percy could be startled to see Artemis suddenly appear in the woods. Artemis, on the other hand, may be trying to figure out why Percy is there. She might question him immediately, and Percy would have to explain his presence, perhaps stuttering a bit as he is in the presence of a major goddess.
In a fanfiction, the first encounter between Nick Fury and Batman might start with a misunderstanding. Fury could be investigating something in Gotham that Batman is also looking into. They might cross paths and assume the other is a threat or a criminal. Batman would use his stealth to observe Fury first, while Fury would be using his S.H.I.E.L.D tech to detect any potential danger. When they finally face each other, there would be a moment of stand - off, each waiting for the other to make the first move.
It could be a very tense encounter. Harry might sense a strong and different kind of power in Bankotsu, and Bankotsu would be baffled by Harry's wand and the spells he can cast. For instance, if Harry uses a spell to defend himself when Bankotsu approaches, Bankotsu would think it was some sort of strange attack and immediately draw his weapon. But then, they might realize that neither of them really wants to fight without proper understanding.
Their first encounter might be quite tense. The Straw Hat crew could be on their guard because they know of Hancock's reputation. Hancock, on the other hand, might be sizing them up, especially looking at Luffy. She might be expecting them to show some sign of fear or submission, but the Straw Hat crew, being who they are, would probably stand their ground. Luffy might just greet her casually, which could either annoy or amuse Hancock.
Imagine Snape is in a forest near Hogwarts, collecting potion ingredients. Lily Luna Potter, who is on an adventure with her friends, stumbles upon him. Snape is startled and defensive at first. But when he sees Lily Luna's face, he's stunned. Lily Luna is equally shocked to see this infamous figure. There's a long moment of silence as they both take in each other's presence, with Snape's mind racing with memories of her mother and Lily Luna trying to figure out what to do next.