In many fanfictions, Percy's first reaction is shock. He has grown up thinking his father was absent from his life. But when Poseidon appears, he has to quickly process this new reality. He might start asking a lot of questions right away, like why he left him and his mother, and what his intentions are now that they've finally met.
He might be in awe. After all, he has only heard stories about his father. So when he finally sees Poseidon in person, he could be speechless for a moment.
Anakin might be shocked at first. After all, he may not have expected to ever meet his father. He could be hesitant and full of questions.
Izuku might be shocked at first. After all, he has grown up without his father. But then he could be filled with a mix of emotions like joy, confusion, and anger all at once.
He might be shocked at first. After all, he has probably only heard stories about his father. Then he could be angry, blaming his father for not being around when he was growing up.
Goku's reaction could be a mix of shock and happiness. On one hand, he never expected to actually meet his parents. On the other hand, he has always longed for a family connection. He might start asking them a million questions right away about their lives, Saiyan culture, and what it was like when he was born.
He's probably shocked at first. Naruto has grown up without his parents, and suddenly having grandparents appear is a huge surprise.
His father might be extremely proud. After all, Goku has achieved so much, like protecting the Earth multiple times. He would look at Goku with admiration for his strength and kindness.
Percy would probably be cautious. He's been through a lot with the Greek gods, and he knows how powerful divine beings can be. So, he'd approach this new encounter with wariness.
In this fanfiction scenario, Harry could be initially stunned. He has to come to terms with being a father and also deal with the potential implications of the Tom Riddle connection. He might be very protective right away, making sure his kids are safe from any harm that could be related to the dark past of Tom Riddle. His reaction could also be shaped by how much he has changed since his own battles with Voldemort (who was once Tom Riddle), and he'd be determined not to let his kids face the same kind of danger.
Well, in a fanfiction, Percy might meet his father during a time of great danger. Poseidon could appear just in time to save Percy from a powerful enemy. Then, instead of just a brief encounter, they spend some time together. Poseidon tells Percy about his mother, Sally, and how much he really cared for her. He might also train Percy in some advanced sea - related skills, like how to communicate with the oldest and wisest of the sea creatures, which could be really helpful in Percy's adventures.
He might be extremely angry and feel a deep sense of hurt. After all he has done for Poseidon and the gods, being betrayed would shatter his trust. He could go into a period of self - exile, distancing himself from the demigod world and trying to find his own path without the help of his father.