The comic shows that Zuko's mother was forced to go into hiding to protect herself and others from certain powerful forces. It's a pretty intense storyline.
I'm not a big fan of 'lemon' fanfictions as they often contain inappropriate content. However, there are many great Prince Zuko and Katara fanfictions that focus on their relationship development, adventures together, and how they overcome challenges in a more family - friendly way.
Maybe Prince Zuko meets a girl from another nation who is a healer. She helps him when he is injured during a battle. Zuko is intrigued by her kindness and her different way of looking at the world. Their love story develops as he tries to show her that not all Fire Nation people are bad, and she tries to heal the wounds between their nations through their relationship.
A strong - willed Earth Kingdom noblewoman could be a good match. She would understand the politics and power struggles, much like Zuko. And her Earth Kingdom upbringing would contrast with Zuko's Fire Nation heritage, leading to interesting interactions. They could bond over their shared desire to bring peace and stability to the war - torn world.
Growth is a major theme. Zuko's character grows and matures as he experiences love. He becomes more empathetic and understanding. Another theme is the power of love to change. Love can change Zuko's perspective on things like the war or his family. In some fanfictions, his love for a certain character makes him question the Fire Nation's aggressive ways and strive for a more peaceful solution.