One great 'Chrono Trigger Fanfiction' is 'The Time Traveler's Legacy'. It expands on the original game's time - travel concept in an exciting way, following a new character who gets caught up in the time - traveling adventures. It has really well - written action scenes and character development.
First, know the source material well. You need to be familiar with the characters, the world, and the time - travel mechanics of Chrono Trigger. Then, come up with an original idea that can fit within the existing universe. For example, you could focus on a minor character and give them a more prominent role.
One possible trigger could be the memory of losing Sasuke. Sasuke's departure has always been a huge emotional blow to Naruto. Every time he recalls the moment when Sasuke left the village, it might stir up intense feelings of helplessness and fear of losing his friend forever, leading to a panic attack.
A new character could be introduced as the main villain. For example, a powerful demon from another realm who has the Devil Trigger ability and wants to conquer Naruto's world. This demon could have minions with similar powers and Naruto would have to figure out their weaknesses in order to defeat them.
One idea could be Naruto somehow getting a Devil Trigger power during a battle with a powerful new enemy. Maybe he discovers an ancient artifact that fuses with his chakra and gives him this new ability.
Sorry, I'm not a fan of online literature. I'm just a person who likes to read novels. I can't answer questions about the Legend of Mir 2 or other games because my knowledge doesn't involve these games.