AN: I mentioned a few posts back that I had some stories on my profile that were dead at this point for various reasons and that they would be replaced. Well, this is the next 'replacement story' being put up. 'That Time I reincarnated as a Slime' has honestly become one of my favorite anime and, given that I've been rewatching the show as I introduce my best friend to it, I had to write a fic for it.

Wait, I reincarnated as a WHAT?! (Working title)

Chapter 1

-Percy-

The sun was shining in a sky that was rapidly becoming clear and blue. He could hear the monsters fleeing in fear as Gaea's body crumbled to ash and dust on the slope of Half-Blood Hill.

But all he could feel was pain, the trident of Polybotes having impaled him, thrown by Gaea herself.

"Ambrosia!" Annabeth screamed at the shellshocked demigods as she cradled him, the girl who was as close as a sister to him trying to stem the bleeding, "Someone get me some fucking Ambrosia and Nectar!"

"We don't have any left." Rachel had tears running down her face, a sword slipping from the oracle's limp fingers, "We used it all in the skirmishes…there's none left." One by one, the reality was sinking in to the watching demigods as Percy coughed, weakly managing to grasp Annabeth's hand.

"Wise Girl," he coughed, making her turn her attention to him rather than struggle to find a solution to a problem that couldn't be solved "please…just…just let me die with my friends." He could hear the echoing of a cord being snipped that nobody else seemed to hear. He knew it was his time, and he wanted those he cared about with him when he went.

"You idiot." Annabeth sobbed as she cradled him, the other members of the Greek and Roman armies bowing their heads in respect, those he was closest to kneeling by him as Annabeth refused to let him go, "That spear was meant to hit me…you…you should have-"

"Hey." He coughed, feeling more and more of his blood turning into acid as his body struggled to fend it off, "You'd…you'd have done the same for me." He coughed up a bit of blood "Hey, maybe if Uncle Hades lets me keep my memories, I'll try for reincarnation."

Acceptance of reincarnation confirmed.

Request confirmed. Acquisition of the skill 'Perfect Memory' is successful.

Oh, great, he was going crazy in his last moments…or it was the blood loss, either one.

"It'd be nice…if I didn't have to worry about monsters in my next life." Percy chuckled, thinking wistfully of the monsters he'd befriended and those he'd felt pity for, wondering what a life would be like where monsters didn't attack him on sight for being a demigod.

Requests confirmed. Creating a body that does not need blood. Further parameter, body that will be accepted by monsters. Creation successful.

Huh, maybe he wasn't crazy, maybe the gods were doing him a solid and granting his wishes for reincarnation? It'd be nice after all he went through.

"I'll see to it Percy." Nico, his cousin, promised, the darkly dressed Ghost King not bothering to hide his tears, "Even if I have to fight Dad and Zeus himself to make it happen."

"I believe you cuz." Percy chuckled, doing his best to smile and ignore the pain. He didn't want their last memory of him marred by him screaming in agony.

Request confirmed. Acquisition of the skill 'Pain Nullification' is successful.

Well, at least the voice was nice. He hoped he would have someone like Annabeth with him in his next life. Percy glanced over at the blond who had been at his side since day one at camp, "I…know you can lead them for me now Annabeth." He gave her a weak smile, "You were always the brains between us anyway."

"You jerk." She cried, "Going and dying just to get out of the responsibility." But he could tell she didn't mean it.

Request confirmed. Acquisition of the skill 'Sage' is successful. The skill 'Sage' has evolved into the Unique Skill 'Wise Girl'.

A life where he had someone like Annabeth in his life? And where he didn't have to worry about monsters? About having no choice but to live like a predator hunting to survive?

Request confirmed. Acquisition of the unique skill 'Predator' is successful.

It…will be nice. Percy gasped as the pain from the acid grew closer and closer to his heart even as more and more blood spilled from his body, his time was almost up.

His limbs were growing heavy even as his vision started to go dark as he wondered if there were any last requests he wanted to make to the world, or the voice, or whatever he'd been speaking to.

He felt his blood running down his skin. The blood of a demigod of Poseidon.

Yeah, that was it. He wanted to keep the gifts his father had given him when he'd been born.

Request confirmed. Demigod soul further reinforced for reincarnation. Acquisition of unique skill 'Prince of the sea' is successful.

'Prince of the Sea' reinforcing body, forcing evolution.

'Prince of the Sea' reinforcing skills.

Acquisition of the skill 'Heat resistance' is successful.

Acquisition of the skill 'Cold resistance' is successful.

The skills of 'Heat resistance' and 'Cold resistance' have combined into the skill 'Thermal Fluctuation resistance'.

Acquisition of the skill 'Electric current resistance' is successful.

Acquisition of the skill 'Paralysis resistance' is successful.

Acquisition of the skill 'Water Manipulation' is successful.

Acquisition of the skill 'Aquatic life speech' is successful.

Acquisition of the skill 'Equine Speech' is successful.

The skills 'Aquatic life speech' and 'Equine Speech' further evolved into 'Language Mastery'.

Hearing the barrage of information was the last thing Percy was aware of as his body finally went slack, his final breath left his lips, and Percy Jackson passed away.

Until he suddenly wasn't.

"What the hell?" Percy groaned, trying to figure out what had happened. He didn't feel any pain anymore, but he couldn't feel the dirt of Half-Blood Hill either. He couldn't feel Annabeth's hand on his own, or hear his friends around him.

"Wait, I can't even feel my hand." Percy tried to feel himself in the darkness, his eyes struggling to open. Had…had he actually reincarnated? Was that why he wasn't where he'd been mere moments ago?

"Confirmed. Reincarnation of demigod soul was successful." The voice from before was back, although now it sounded different. As Percy worked to calm down his suddenly racing heart from the shock, he noted it sounded almost like Annabeth's "Strength of Demigod soul has triggered the evolution from 'Slime' to 'Primordial Slime'."

"Wait…did you say slime?" Percy blinked for a moment before the statement fully hit him, "I'M A FUCKING SLIME?!" in the shock of it, the eyes of this new form actually managed to snap open, letting him look in a pool of water he had reincarnated near. His body was a deep dark blue, he had a pair of what looked like thin lines that seemed to be his eyes although his body was so small that he couldn't see many details beyond that.

"Confirmed. Due to requests of a body that would not require blood, and a body that would be acceptable to monsters. You were reincarnated as a slime. The power of your soul triggered its evolution."

He tried to remember back to everything he half thought to have been a hallucination as he lay dying, "And…and you're my skill 'Wise Girl'?"

"Confirmed." The voice was tender, "I am here to guide you, and to support you."

"I…thank you." Percy took a deep shaky breath; some tears fell from his eyes as he glanced around where he was. He'd studied all sorts of monsters and 'slimes' weren't something he'd found any record of back in his last life. Nor did he recognize the strange plants and glowing rocks around him.

"Answer: This world is known as 'the Central Axis world'." Wise girl clarified for him, "A world separate from 'Earth'. Further, with your Unique Skill 'Predator' you are capable of absorbing and consuming whatsoever you wish. Items consumed by the Predator skill will be stored in your slime stomach to be analyzed. Analyzing what is stored can grant you their skills and abilities, understanding of their structure, and the capability of assuming the form of analyzed creatures. Furthermore, the Predator skill is capable of storing harmful items that cannot be analyzed separately."

"Thanks, Wise Girl." Percy shook slightly as he came to terms that he'd reincarnated, but not to a place he'd likely see those he knew again. He'd never get to see his mom or Paul again, never get to see little Estelle grow up. Never help another demigod at the camp or keep getting to know his new friends in the Seven.

But…he still had a new chance at life. He knew that his friends would not have wanted him to spend his new life wallowing in despair. And, in a way, he still had a bit of Annabeth with him.

"Alright, time to get started on my second life." Percy focused, finding his new gel like body to be malleable to his will. He started trying to force it to move and alter, wanting a more humanoid shape. Stretching out one of the still misshapen 'limbs' he was growing, he grabbed an herb and a glowing rock, the items dissolving and getting absorbed into his body.

"Wise Girl, analyze please."

Analysis successful."

AN: So yeah, that's just to get the story set up. I was originally considering having Percy reincarnate as a Minotaur just for the irony, but a lot of the fun of 'That Time I reincarnated as a Slime' for me was everyone and their mother underestimating Rimuru because 'oh, he's just a little slime' and I didn't want to lose that fun here XD.