The plot might start with the hurt reader running away from home after an argument with their family. They end up in a magical garden where Tikki and Plagg are. Tikki offers the reader some magical treats that have the power to heal emotional wounds. Plagg, meanwhile, teaches the reader how to be more carefree. The reader then has a series of adventures with the kwamis, learning important life lessons along the way and eventually mending their relationship with their family.
It could be Hawk Moth. Since he's always after the Miraculouses, he might sense the presence of Tikki and Plagg with the hurt reader and try to manipulate the situation to get the Miraculouses. He could use the reader's vulnerability against them, trying to convince the reader that giving him the Miraculouses would solve all their problems.
Definitely not true. Rikki Tikki Tavi is a work of fiction. It was crafted to bring adventure and imagination to the readers, not based on real events or people.
Well, if Plagg gets akumatized in fanfiction, it could lead to some really chaotic situations. Plagg's powers are already quite strong as a kwami, and with the akuma's influence, they might become uncontrollable. For example, his cataclysm power could be misused on a large scale, causing destruction all over Paris. Maybe he would turn against Adrien and the other heroes, creating a big rift in their relationships and making it extremely difficult for them to fight back.
One possible fanfiction could be about Marinette's daily life with Tikki. For example, Marinette could be having a tough day at school, getting bullied by Chloe. Tikki, being her kwami, tries to cheer her up by suggesting they make some special macarons. They then spend the evening in Marinette's room, sharing stories and laughing, which helps Marinette forget about her bad day.
In 'Rikki Tikki Tavi', Rikki Tikki has to face and defeat two snakes to keep the human family safe. There's a lot of tension and excitement as he shows his courage and skills.
The main conflict in 'Rikki Tikki Tavi' is between the mongoose Rikki Tikki and the snakes Nag and Nagaina, who threaten the safety of the human family and Rikki's new home.