One common theme could be friendship. Since it's related to a character (Phil), the relationships he has with others, especially within the context of the 'hangover' situation, might be explored in terms of friendship. Maybe how friends support each other through tough times.
Another theme might be self - discovery. Phil could be going through a process of learning more about himself during or after the hangover. It could be about his strengths, weaknesses, and how he views himself in different situations. And also, the theme of redemption can be present if Phil made some mistakes during the hangover and is trying to make up for them.
The theme of chaos and recovery is quite common too. The hangover itself represents chaos, and the fanfiction might focus on how Phil and the other characters navigate through that chaos and eventually recover. It could involve dealing with the physical and mental aftermath of a wild night, like trying to piece together what happened and getting their lives back on track.
Chapter 339, "The Changes of Li Hu and Yang Zhong, the Hou Family's Opportunity, Advice (Part 3)", is the clearest early answer because it turns Yang Zhong's situation into a concrete plot event. The setup is Speaking of this, Li Hu paused slightly, his pupils revealing a look..., but the pressure keeps building through Even if we trained to death, we might not compare." Yang Zhong's....
Chapter 351, "Lu Yang's Plan, Drastic Change in Xia City, Sumeru Nightmare, His Highness's Golden Words", is the clearest early answer because it pushes Lu Yang into a new phase or setting. The chapter turns that into something concrete by moving from As Xia Hong was about to get up, a thought suddenly crossed his mind. to Xia Hong walked out of the hall, waved his hand indicating no need to....
Chapter 100, "Ominous, there might be a bloody disaster!", is the clearest early answer because it turns Haunted House Adventure's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The barrage was about to die of laughter.
Chapter 342, "Founding Ceremony, Childhood Sweethearts, Did the Star-picking Hall Catch Fire?", is the clearest early answer because it turns Cold Beasts's situation into a concrete plot event. The chapter turns that into something concrete by moving from Hong Gang's Green Wolf Hunting Team has long since upgraded to an... to The three of them continued walking along the edge of the medicinal....
Chapter 46, "Why Am I Second to Last?!", is the clearest early answer because it turns Last's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing this, everyone but Jiang Li perked up with high alert.
Chapter 256, "Bonfire Feast", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Turning around, Jiang Yan and Zhao Lang found their heads had been... and closes on I was dazzled seeing Jiang Li trending today." Next door, Su Yinwan....
Chapter 109, "Not One Deserves to Stay on His Friends List!", is the clearest early answer because it turns Is Jiang Yan's situation into a concrete plot event. It opens with And another thing," Jiang Li said, taking out a tissue to wipe her...
Chapter 340, "Seclusion, Growing Yu Generation, Family Banquet, Rapid Development", is the clearest early answer because it turns East Ridge's situation into a concrete plot event. The chapter turns that into something concrete by moving from As the night of the tenth day of September descended, Lu Yang set out... to Though Xu Ning and Lu Yang are not extraordinarily strong, they have....
Chapter 143, "How about Grandma introducing a girlfriend to you?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Is there really such delicious fish soup in the world?
Chapter 330, "Longshan System Gathering, Simplified Sect System", is the clearest early answer because it turns Meng Ying's situation into a concrete plot event. The setup is Just as everyone in Xia City was preparing to welcome the Cold..., but the pressure keeps building through In a gathering hall on the second floor of the main building, there....