A cool plot could be that the Dragon Balls are scattered across the One Piece world. Goku and his friends lose their memories and end up in different parts of the world. Luffy and his crew find Goku and try to help him regain his memory. As they search for the Dragon Balls, they encounter all sorts of enemies. Some of the One Piece villains like Doflamingo try to use the Dragon Balls for their own desires. And the Saiyans start to remember their powers slowly as they fight alongside the Straw Hats.
One possible plot could be that Luffy and his crew are sailing in the Grand Line when they encounter a strange energy. It turns out to be a Dragon Ball. They then have to deal with various villains from both universes trying to get the ball. Maybe Frieza hears about it and teams up with some of the pirates from One Piece. And Goku, sensing the power of the Dragon Ball, also arrives in the One Piece world to help Luffy protect it.
Chapter 721, "Apology", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 460, "Saving People", is the clearest early answer because it turns Traditional Chinese Medicine's situation into a concrete plot event. Early on, [HAHAHAHAHAHAHA, Jiang Yan is impersonating me.] [At this moment, I.... By the end, Dare to attack me in hiding?!.
Chapter 636, "Beg Me", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Uh..." Zhao Lang scratched his nose, feeling a bit embarrassed, "I...
Chapter 392, "Connected to Shang Shaobai", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Bai Lu's hopeful heart had sunk once again. to Why not give it one more try?.
Chapter 660, "Includes Meals and Accommodation?", is the clearest early answer because it turns Includes Meals's situation into a concrete plot event. The chapter turns that into something concrete by moving from My point exactly," Jiang Li said, "I'll pay off the over twelve...
Chapter 475, "Doting on the Man You Love to the Fullest", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with On the other side, Jiang Yan and Shang Shuyue also set off.
Chapter 524, "He Faces Imprisonment", is the clearest early answer because it turns Yu Li's situation into a concrete plot event.
Chapter 427, "Wearing Slippers onto the Stage", is the clearest early answer because it turns Xi Yang's situation into a concrete plot event. It opens with He was eager to break free, but Jiang Shixu, the skinny little guy,...
Chapter 544, "I Shouldn't Have Stopped You from Pursuing Shang Shaojing Back Then", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event.
Chapter 430, "I Quit", is the clearest early answer because it turns Nina's situation into a concrete plot event. The setup is Hey, do we join a team that's short on members, or do we form our..., but the pressure keeps building through I want to join Team A and follow Ji Yanbai..