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.
One possible scenario could be that Blu is initially nervous when he meets his mother. He might be hesitant, but as they start to interact, he realizes how much he has in common with her. For example, they could both have a unique way of communicating with other birds. Their reunion could be filled with a mix of emotions, from joy to a bit of awkwardness at first.
She could be a former pirate captain herself. Maybe she was one of the most feared pirates in her time, and her skills and reputation were passed down to Luffy in some way, even if he didn't know it was from his mother.
There could be a power - hungry being who wants to use Goku's mother for their own gain. When Goku tries to meet her, this being tries to stop him because they know that if Goku and his mother reunite, they will be able to oppose their evil plans together.
Well, it could be that Goku meets his mother in a dream world. Maybe she gives him some advice on how to become even stronger. She might share some long - forgotten family secrets with him too.
In 'Naruto meets his mother' fanfictions, a prevalent theme is the filling of a void. Naruto has always felt the absence of his parents, and this meeting fills that emotional gap. Additionally, there might be a theme of growth. His mother's presence could inspire Naruto to grow even more as a ninja and as a person. And sometimes, the theme of redemption can be there, especially if there are elements in the story related to Naruto's past struggles and how his mother's appearance helps him move forward from them.
In such a fanfiction, Naruto might have an emotional moment. He could finally learn more about his family's past directly from his mother. Maybe she would share some secret jutsu or wisdom with him.
One possible plot could be that Kakashi, while on a mission in a mysterious forest, stumbles upon a strange and powerful force. As he investigates, he is suddenly transported to a different realm where he meets his mother. His mother reveals secrets about his family's past and the origin of his Sharingan. Then they have an emotional conversation about how much she missed seeing him grow up.
The fanfiction might start with Natsu's search for his mother. When they meet, there could be some initial shock or disbelief. His mother could look at him with great love and pride. They might have a long conversation about his life so far, his friends, and his adventures. She could also introduce him to parts of his heritage that he was previously unaware of, which could shape his future actions and decisions in the story.
In this fanfiction, it could be that Luffy's mother was thought to be dead but was actually held captive by a powerful enemy. When Luffy finally meets her, she's weak but still full of spirit. She encourages Luffy to keep fighting against the corrupt world of pirates and marines alike. She might also have some inside information about the One Piece, like a clue that she's been holding onto all these years, which sets Luffy on a new and exciting part of his adventure.