There could be a fanfiction where Haruka discovers a hidden talent among the princes that no one knew about before. This could lead to new collaborations and deeper relationships. For example, she might find that one of the princes is an amazing composer in secret and they start working on a special project together.
There might be a 'uta no prince sama x reader fanfiction' where the reader is a foreign exchange student at their school. The reader is initially shy but is drawn into the world of the princes through a music competition. In this story, the reader discovers their own musical talent with the help of the princes.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'uta no prince sama haruka lemon' in their search bars.
Give your male OC some flaws. He could be overly competitive, or have a fear of performing in front of large crowds. These flaws make him more human and relatable. Also, think about his appearance and how it might reflect his personality. A more reserved OC might dress simply, while a flamboyant one could have a more outlandish style.
One idea could be a male OC who is a talented but shy songwriter. He joins the school and has to overcome his shyness to collaborate with the Uta no Prince sama characters. Maybe he has a unique musical style that challenges the traditional styles in the school.
Another way is to join 'uta no prince sama' fan communities on social media platforms like Tumblr or Reddit. People there often share and recommend their favorite fanfictions. You can also ask for suggestions in those groups, and fellow fans will be more than happy to point you to some great 'uta no prince sama x reader' stories.
As of now, Uta is indeed alive. The story hasn't depicted anything otherwise. Maybe there'll be changes in the future, but for now, Uta's part in the manga continues with them being alive.