Naruto: The Outsider's Resolve - Chapter 1.6 (016):

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?

- Description from novelbuddy

[Unique Trait – Those you meet will remember you. No matter what happens, they will remember you forever.] In a world on the brink of ruin, people summoned to save it are categorized as heroes and extraterrestrial workers, abbreviated as “foreign workers.”For some reason, I became a foreign worker who is loved by transcendents that view humans as mere insects.

This is a story about a reborn Immortal Emperor, who plays the fool to trick his enemies!The regrets of the past life will not be repeated in this life! If one day I become the Immortal Emperor, I shall ensure blossoms bloom profusely!