One possible theme could be her struggle with authority. If she's angry, it might be because she's facing issues with those in power over her in the story's universe.
I'm not sure where to specifically find 'angry Lin Beifong fanfic'. You could try searching on some well - known fanfic websites like Archive of Our Own. There might be some works there that feature an angry Lin Beifong.
A strong and noble character like Mako could be a great love interest. He has his own sense of justice and duty, which could match Lin's. They could bond over their shared experiences in the police force and protecting the city. Their relationship could start as a mutual respect for each other's skills and then develop into something more romantic as they get to know each other on a deeper level.
There's no way Naruto can be the father of Lin Beifong in any legitimate sense. The two characters belong to entirely separate fictional settings. Naruto has his own story in the Hidden Leaf Village with his family ties related to Konoha. Lin Beifong, on the other hand, is an important part of the Avatar world's Republic City. Their abilities, cultures, and storylines are so distinct that it would be a very odd and non - canon pairing in fanfiction.
Finding a good 'Crying Lin Beifong Fanfic' can be a bit of a hunt. First, consider what kind of story you're looking for. Is it a sad backstory exploration? Or perhaps a current - day emotional turmoil for Lin Beifong? Once you have that in mind, start by looking at the tags on fanfic platforms. Tags related to Lin Beifong, sadness, and emotions might lead you to the fanfic you're seeking. Also, don't be afraid to sample a few. Sometimes the best ones are hidden among many others.
One possible plot could be that Lin Beifong, who is often seen as a tough and independent character, meets someone unexpectedly. Maybe it's a new recruit in the police force who is initially intimidated by her but later sees her vulnerability. He starts to bring her small gifts like her favorite tea and they gradually start to open up to each other, sharing their past traumas and fears. This new relationship helps Lin to soften her hard exterior and she starts to enjoy life more outside of work.
One common theme is family. Since the Beifong family has a long history in the Naruto world, many fanfics explore family dynamics, like loyalty, heritage, and the passing down of skills. Another theme is power. How the Beifong characters develop and use their unique powers is often a big part of these fanfics. Also, friendship can be a theme, as they interact with other Naruto characters.
In addition, there could be new villains emerging, like a powerful earthbender who has gone rogue and wants to prove himself by defeating Lin Beifong's daughter. This villain could have a different ideology about earthbending and see the daughter as a symbol of the old way that he wants to change.
A common theme is friendship. The OC often becomes a close friend to Lin, helping her through tough times or just being there to have a good chat. For example, an OC might be someone who Lin meets during her police work and they form a bond over their shared sense of justice.