Well, in these fanfictions, a recurring theme is Percy's perseverance. Tartarus is full of terrors, but he doesn't give up. It's like he's constantly fighting against the odds. And there's often the theme of hope. Even though he's alone, he holds onto the hope of getting out or making a difference. Sometimes, there's also the theme of facing one's past traumas. Tartarus might bring up things from his past that he has to deal with in order to move forward.
Survival is a big one. Tartarus is a very hostile place, so Percy has to fight to stay alive. Another theme is redemption in some cases, like if he feels responsible for getting thrown in there.
Survival is a big one. Tartarus is such a harsh and dangerous place, so Percy has to find ways to stay alive. Another theme is self - discovery. Facing the extreme challenges there makes Percy learn more about his own strength and limitations.
The theme of self - discovery is quite prevalent. After Tartarus, Percy may start to question who he is and what his purpose is. He has faced such extreme situations that it makes him reevaluate himself. Also, the theme of power and its limits is often explored. He might have gained new powers or a new understanding of his existing powers during his time in Tartarus, and fanfictions play around with how he uses or controls them.
Well, one possibility could be Percy facing his inner demons. In Tartarus alone, he might have to deal with the memories of his past failures and the fear that comes with being in such a desolate place. He could encounter strange and terrifying creatures that test his combat skills and his will to survive.
There's a chance that Percy meets the personification of Tartarus itself. It could be a shadowy, all - powerful being that tries to break Percy's spirit. Percy, being the brave hero he is, would have to resist and find a way to either outwit or overpower this entity in order to continue his journey in Tartarus.
One common theme is self - discovery. When Percy is alone, he has to look inward and figure out who he really is without the influence of his friends. Another theme could be survival. He has to fend for himself and use his skills to stay alive in various situations.
If Percy were alone in Tartarus in fanfiction, the story might focus on his inner struggle and growth. He'd face extreme dangers and might discover hidden strengths within himself.
He might face numerous terrifying monsters. Tartarus is full of dangerous creatures, and without his friends, Percy would have to rely solely on his own skills and the power of his demigod abilities to fight them off.
He uses his wits. Percy has always been clever, and in Tartarus, he'd use that to his advantage. He'd find ways to outsmart the monsters, like using the environment against them.
Perhaps Percy has to go to Tartarus alone because he believes it's the only way to save his friends. In Tartarus, he might encounter old foes who are now even more powerful. He has to rely on his wits and his skills with his sword, Riptide. He could also make unexpected alliances with some of the creatures there in order to survive and achieve his goal.