One common theme is the exploration of Goku's relationships outside of his usual fighting and training. Another is the development of the female characters in the harem, showing their unique personalities and how they interact with Goku.
Often, a theme is Goku's growth in terms of his emotional intelligence when dealing with his harem. He's used to being a fighter, but in these fanfictions, he has to learn about love and companionship. Also, there's the theme of teamwork among the harem members and Goku when they face challenges together, which is quite different from the solo battles Goku is known for in the original series.
Chapter 416, "Such a Sensitive Nose, Born in the Year of the Dog?", is the clearest early answer because it turns Guan Xiong's situation into a concrete plot event. It opens with Yu Li's words successfully choked Lady Nina. and closes on Why did she have to end up with such a dumb teammate?!.
Chapter 279, "The Sudden Blaze", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. It opens with After getting a good scolding, Jiang Yan resigned himself to lying...
Chapter 258, "Explosive! Jiang Li and Director Sun Are Having an Affair!", is the clearest early answer because it turns Explosive's situation into a concrete plot event.
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jin Si Yue suddenly realized that his wrist was back in proper...
Chapter 598, "She Blew Up Your Family's Lake!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event.
Chapter 436, "Do You Remember Brother Daniu by Daming Lake?", is the clearest early answer because it turns Brother Daniu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Yu Li took the object that resembled a stone axe and weighed it in...
Chapter 450, "Your dear brother is making breakfast for you!", is the clearest early answer because it turns Lao San's situation into a concrete plot event.
Chapter 391, "Has another top celebrity had a scandal?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 320, "How is She Here Too?!", 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 Although she thought this way, Su Yinwan still knew the importance of...
Chapter 470, "Why Talk About Pigs When Looking at Him?", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. It opens with Wrapped in a bit of warmth, Jiang Yan slowly came to.