One common theme is family. Since the series has strong family elements, fanfictions often explore different family dynamics within the Super Lovers universe. Another theme is love and friendship, as the relationships between the characters are central to the story.
Well, there's 'The Journey Together'. This fanfiction takes the characters on an adventure outside of their usual setting, exploring new relationships and challenges. It has great character development and an interesting plot. Also, 'Hidden Bonds' is a great read, highlighting the hidden aspects of the characters' relationships.
One common theme could be emotional pain. Since it's 'ren hurt', there might be a focus on Ren experiencing some form of emotional distress, like heartbreak or feelings of betrayal. Another theme could be self - discovery in the face of that hurt. Ren might be trying to figure out who he is and how to move forward after the difficult situation.
Well, its popularity varies. In the niche community of Super Lovers fans, there is a significant group who enjoy reading and writing such fanfiction. They like to delve deeper into the characters' relationship and develop their own interpretations. But in a broader sense, compared to mainstream fiction, it's only popular within its specific fandom. It also depends on how much exposure and promotion these fanfictions get within the Super Lovers community.
I'm not sure specifically which 'super lovers ren hurt fanfiction' to recommend. You could try searching on some popular fanfiction websites like Archive of Our Own. There might be a variety of stories related to 'super lovers' with the theme of 'ren hurt' available there.