One more theme could be identity. Naruto has this new 'dark godlike' identity which he has to come to terms with. In the context of the harem, this affects how the other characters perceive him and how he interacts with them. There is also the theme of growth, both in terms of Naruto's power and his emotional maturity as he navigates his relationships with the harem members which is often explored in these fanfics.
Power is a common theme. Since Naruto is 'dark godlike', power dynamics play a big role. Also, love and relationships within the harem are common. Each girl in the harem has a different kind of relationship with Naruto, be it based on admiration, friendship turned into love, etc.
The struggle between light and dark is often there. Naruto, being a 'dark godlike' character, may have to deal with his own inner demons while also maintaining his relationships. Redemption can also be a theme. He might be trying to atone for his darker actions through his relationships with the harem members. And of course, the harem aspect itself means themes of jealousy and competition among the female characters.
Chapter 663, "How Did These Two Start Fighting?!", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter gives readers a real answer by opening on Jiang Shixu received the message in daylight the next day.
Chapter 614, "Storm Crisis", is the clearest early answer because it turns Storm Crisis Wilderness's situation into a concrete plot event. The chapter turns that into something concrete by moving from Today, the wind on the island was stronger, and for safety reasons,...
Chapter 546, "Good Sister, Stop Hitting Me, I Was Wrong!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 649, "Where Did the Wild Wolf Come From?!", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. It opens with Several people successively lay down in the tent, and before long,...
Chapter 405, "The Person Saved Casually Turns Out to Be a Diplomat?!", is the clearest early answer because it turns Foreign Liaison Committee's situation into a concrete plot event. Early on, The medical student was completely dumbfounded..
Chapter 334, "Do you not want to because you look down on me?", is the clearest early answer because it turns Do's situation into a concrete plot event.
Chapter 435, "A Skilled Housewife Can't Cook Without Rice", is the clearest early answer because the violence around Dragon Ridge Island becomes final instead of hypothetical. The chapter gives readers a real answer by opening on The elderly dean looked at Zhao Lang with a tinge of regret.
Chapter 271, "How Did Shen Lan Marry an Old Fool?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from He had barely finished speaking when he received a withering look...
Chapter 570, "A Simple Auto-Attack Baits Out an Ultimate from the Enemy", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with What the heck is that?" "??
Chapter 314, "The teacher will surely cultivate you into a new music star!", is the clearest early answer because it turns Zhou Wenshan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After chatting with Zhou Wenshu for a bit, Jiang Li called Jiang...