In a romance novel: 1. Easy to remember and spell: User names should be easily recognizable and remembered, it is best to use common combinations of letters and numbers. 2. Uniqueness: The username should be unique enough to attract the reader's attention. Consider using some personal vocabulary or phrases or using creative ideas that are similar to the user names on other websites or social media. 3. Does not contain sensitive information: The username should not contain any sensitive information such as real name, address, phone number, etc. Therefore, in romance novels: - Little Wolf, Pen Name, Xueluo, Liuhua, Liuyun, etc. - Xinyi, Pen Name, Xueluo, Liuhua, Liuyun, etc. - Star, Pen Name, Snow Fall, Flowing Flower, Flowing Cloud, etc. - Meng Ying, Pen Name, Xueluo, Liuhua, Liuyun, etc. - Sleepwalking, Pen Name, Xueluo, Liuhua, Flowing Cloud, etc. Of course, the specific username would depend on the author's actual situation and personal preferences.