It's hard to say for sure. The availability of Venti in the story depends on multiple factors such as the story's genre, setting, and the author's intentions. It could be possible, but you'd have to look closely at the story's details to know for sure.
Yes, you can get Venti from the story. In the game's story, Venti is a key character. His story is intertwined with the lore of Mondstadt. For example, his role as the Anemo Archon is revealed through various quests. These quests show his connection to the city, its people, and the overall history of the region. He has a carefree yet mysterious personality, and his actions in the story often have a significant impact on the events that unfold in Mondstadt.
Well, in a Venti identity reveal fanfic, it could involve Venti dropping his carefree bard facade and showing his more divine or ancient side. It might include scenes where he has to use his true powers to protect Mondstadt from a great threat. And this could lead to a whole new understanding of his character by the people of Mondstadt and the readers of the fanfic.
There is a dispute about whether Qianling Tomb was stolen. Some experts believed that Qianling Tomb was the only one among the eighteen tombs in Guanzhong of the Tang Dynasty that had not been stolen. They pointed out that the anti-theft facilities of Qianling Tomb were so strong that thieves could not open it in a short time. The tombs of Qianling Mausoleum were all sealed with stone strips, pulled with iron bolts or iron rods, and then cast with white iron to connect the stone strips into one. In addition, the Qianling Underground Palace was chiseled in the middle of the stone mountain. It was very difficult to dig a new hole into the underground palace instead of the tomb path. Other scholars believed that Qianling might have been robbed. An engineer involved in the exploration of Qianling believed that Qianling might have been robbed, but he did not provide conclusive evidence. At present, there was still no clear conclusion as to whether Qianling Tomb had been robbed or not. The advancement of science and technology may provide more possibilities to solve the mystery of Qianling Mausoleum, but it is currently impossible to determine whether Qianling Mausoleum has been stolen.