Yes. This event occurs as a significant plot development and has a major impact on the story. Mikasa's action is driven by complex emotions and circumstances within the narrative.
Well, sometimes he uses his titan's speed and agility to dodge the Colossal Titan's attacks and then strike at its nape. It's a classic way to take down a titan in the Attack on Titan universe.
One interesting grisha fanfiction could be about a grisha with a unique power that wasn't explored in the original series. For example, a grisha who can manipulate time on a small scale. This could lead to all sorts of adventures and challenges as they try to keep their power a secret while also using it to help their friends.
Love is also a common theme. Sometimes it's a love between two Grisha, and other times it's a love that crosses the boundary between Grisha and non - Grisha. For instance, a story might show how a Grisha falls in love with a normal person and has to deal with the differences. Additionally, the theme of survival is prominent. Given that Grisha are often in a dangerous world, they have to fight for their survival, both from physical threats and from those who fear their power.
You can start by looking on popular fanfiction websites such as Archive of Our Own. There, you can simply search for 'grisha' and a whole list of fanfictions will come up. You can then sort them by popularity, rating or length to find ones that might interest you.
In the years of Qing, the person who had coerced Si Lili to kill Fan Xian was Lin Gong. Lin Gong was Lin Wan 'er's older brother, and also the Crown Prince and Eldest Princess's man. Fan Xian had come to the capital to snatch the Eldest Princess 'palace treasury and had a conflict with Lin Gong. Lin Gong coerced Si Lili to order Cheng Jushu to assassinate Fan Xian on Niulan Street. Si Lili revealed this information to Fan Xian in the 17th episode of Qing Yu Nian. Lin Gong was the mastermind behind the Niulan Street assassination and controlled Northern Qi's spy network. After Fan Xian learned of this, he decided to take revenge, but was stopped by Wu Zhu, who personally killed Lin Gong.
In the years of Qing, the person who had coerced Si Lili to kill Fan Xian was Lin Gong. Lin Gong was Lin Wan 'er's older brother, and also the Crown Prince and Eldest Princess's man. Fan Xian had come to the capital to snatch the Eldest Princess 'palace treasury and had a conflict with Lin Gong. Lin Gong coerced Si Lili to order Cheng Jushu to assassinate Fan Xian on Niulan Street.