It's fairly common. Fans often look for more content related to their favorite shows. Since 'Attack on Titan' has a large and passionate fan base, there are a lot of fanfics available. 'Aot' fans might watch (read) these fanfics to explore different scenarios that the official story didn't cover. For example, they might want to see how a certain character would react in a different situation or what would happen if a major plot event had a different outcome.
The lack of emotion in the stare can be very creepy. If it's just a cold, dead stare, without any hint of humanity or kindness. It gives the impression that whatever is doing the staring is not alive in the normal sense, or that it has no empathy. This makes the person on the receiving end feel very vulnerable and scared.
Thor could also be in the mix. His god - like powers and different cultural background compared to Yelena would create an interesting dynamic. Maybe Yelena is initially in awe of his abilities or she challenges him in some way, leading to an engaging interaction.
There could be various fanfictions. Maybe some that focus on alternative endings, like ones where certain characters survive who didn't in the original. For example, a fanfiction where Erwin survives and leads the Scouts in a different way.
In " Mental Sin," the complete version of " stare at a dragon and you will become a dragon, stare at the abyss and the abyss will give you a stare " was:
" Gaze at the Abyss. The Abyss will also give you a gaze." This sentence came from the first volume of the Chinese novel " Mental Crime ", written by Fang Yuan. What this means is that when you stare into the dark abyss, you will also be stared at by the abyss because darkness itself is also a dark existence. At the same time, this sentence also emphasized that people should be vigilant and not easily fall into the darkness because the darkness might bring unexpected danger.