Goddess of Ice; Reborn as Naruto's twin sister - Chapter 517: The Eighth Gate?

Tian Long, an orphan without much of a life in both his thirty year long life and lifespan!
To him, a single opportunity was displayed to transmigrate into another world with his Death Book!
"What's this? Is this the body of a three year old? Davis? Is this my name from now on?"
Finding himself possessing a small child, he becomes inwardly conflicted before he faces the truth and his reality!
Young Davis finds himself as the legal heir, the Crown Prince of the Loret Empire in the Grand Sea Continent, becoming a powerful cultivator in a short time...
However, is that all?
Follow his journey as Young Davis becomes a full fledged death's advocate while embodying into the Divine Emperor of Death in the world of cultivation!
"Mn? The route to become the Emperor is a given? Nah, I still don't want it..."
"Oh? I'm courting death you say? Unfortunately for you, death is already my woman..."

Yin BiYue has made the worst purchase ever. After transmigrating countless times into the bodies of canon fodder villains, he buys a ‘Fiend Halo’ from the Rebirth Company, supposedly the best aid for an up and coming final BOSS!

The eldest daughter of Hou Di of Anding, who fled for her life, was concussed by someone slapped with a brick. When she woke up, she became the young daughter-in-law of a farm family.

There are many crises outside, and I am afraid that my life will not be guaranteed. Xi Yao feels that the vest cannot be dropped, nor can it be dropped in death…

In order not to be driven away, Xi Yao, who worked hard, accidentally became the group pet of the Zhou family, and everyone protected her.

Zhou Rong, who had never seen a bride since he was a child, was blackmailed by his father-in-law. He even exploited the money to take the exam. He married a sick wife. OK, absolutely impossible.

In order to express his position, Zhou Rong spoke coldly and ruthlessly, and then found that his little daughter-in-law treated the family’s milk baby better than him…

He thinks that his daughter-in-law is very good, and thinks that he can still work hard…

- Description from novelbuddy

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?