There are definitely some out there. Fanfiction writers like to experiment with different combinations of characters from the Percy Jackson universe. When it comes to Erebus and Thanatos, the stories can range from Percy having to face them in some sort of epic battle to more complex relationships where he has to cooperate with them or even understand their motives. It really depends on the creativity of the writer. Some stories might be a bit darker in tone due to the nature of these two characters, but that also makes them stand out among the more typical Percy Jackson fanfictions.
Yes, there are some really interesting ones. You can find them on various fanfiction websites. Just search using the keywords 'Percy Jackson', 'Erebus', and 'Thanatos' and you'll come across different stories with unique takes on the characters and their relationships.
Well, I've seen a few. Some explore Percy's interactions with the darker aspects of the mythological world represented by Erebus and Thanatos. They often add new layers to Percy's character as he deals with these powerful and somewhat menacing entities. It can be quite fascinating to see how different authors handle the blend of Percy's own heroic nature with the more shadowy elements of Erebus and Thanatos.
Chapter 377, "Master Above, Please Accept Your Disciple's Bow", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter gives readers a real answer by opening on Tell me what it is that you came to ask of me this time?" After...
Chapter 348, "Schemes and Counter-Schemes, the Five of East Ridge, Zhu Yang's Threat, The Dust Settles (Part 5)", is the clearest early answer because it turns East Ridge's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhu Baixu, challenge ring number 1." "Lin Qiang, challenge ring... and follows through with If their cultivation speed isn't faster than ours, they might as well....
Chapter 380, "From today on, you no longer need to work here", is the clearest early answer because it turns Beijing Circle's situation into a concrete plot event. The chapter gives readers a real answer by opening on Seeing the sudden change in the manager's attitude, everyone around...
Chapter 19, "I dare you to touch her!", is the clearest early answer because it turns Shang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with What criminal law is this or that, this was originally none of your...
Chapter 240, "He's the Last One?!", is the clearest early answer because it turns President Shang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Wuuuuh He Bao truly deserves it, Mom always knew you could do it!"...
Chapter 12, "Drunk to the point of not being able to distinguish people after just two bottles?", is the clearest early answer because it turns Mother's situation into a concrete plot event.
Chapter 198, "Jiang·Deceitful·Li is Verified", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.
Chapter 349, "Everyone Who Went Out to Dinner that Night Got Poisoned!", is the clearest early answer because it turns Ye Chu's situation into a concrete plot event. Early on, The news quickly reached Ye Chu.. By the end, Let alone the situation with the Gu Family....
Chapter 173, "Su Yinwan, You Did It on Purpose, Right?", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Jiang Li finally rose from her seat. and closes on Yet Miss Su went out of her way to ask me not to be angry..
Chapter 132, "Looking at me with that kind of eyes, are you afraid I'll eat you?", is the clearest early answer because it turns Brother Niu's situation into a concrete plot event. The chapter turns that into something concrete by moving from The new girl in the live-streaming room went crazy.