I don't own Rick Riordan Series or Kamen Rider and they belong to their respected owners.

Percy Jackson, who was he? Well, he is the son of Poseidon, he fought in the second Titan and Giant War, and was part of two major prophecies. Now he is in a one-man war with a monstrous group called the Gurongi as the ancient warrior known as Kuuga. Now he wakes up in Camp Half-Blood's Infirmary.

"Ugh." Percy groans as he gets up.

"Percy, you're awake!" Will stated as the son of Apollo went to check on him.

"Hey, Will how long was I out?" Percy asked.

"For about three hours," Annabeth answered, coming in to check her boyfriend.

"Hey, Annabeth," Percy smiled as he got off the bed.

"Percy, you shouldn't be up already, you still need to rest," Annabeth says.

"I feel fine, did you guys dump me into the ocean?" The teen quip.

"Percy, this is serious, you should still be in bed, resting." Will chastised. "You've been taking hard beatings from these Gurongis. Even a Demigod like yourself wouldn't be able to get back up in three hours."

Percy gestures himself. "And as you can see I am all fine." He looks at Annabeth. "Do you have any information on our turtle friend?"

Annabeth looks at her boyfriend before sighing. "Thalia IM me on how she and the Hunters spotted on the Gurongi."

"Did they say where?" Percy asked as he headed out.

Annabeth followed him. "They're at Red Hook Grain Terminal."

"That's not far," Percy says.

"Are you taking Black Jack?" Annabeth asked.

Percy shook his head. "Too dangerous, I'll be taking my bike."

The couple exited the barrier and saw Percy's Try Chaser 2000.

"I still can't believe you got a motorcycle," Annabeth said.

"What, it's cool and it connects to Gorum," Percy pointed out.

Percy got on his bike and was about to put on his helmet but was stopped by Annabeth. He was going to ask her what's wrong but was cut off by her lips.

"Stay safe, Seaweed Brain," Annabeth says in a worried voice.

Percy gave her a hopeful grin and a thumbs up, "Don't worry Wise Girl."

Percy puts in his helmet and drives to his destination where the Hunters are facing Go-Gamego-Re.

~/~

At the abandoned grain elevator Thalia and her fellow Hunters were facing Gamego. They were dodging his ball and chain. The girls knew this monster was a tough kill, especially with its hard shell. It was similar to the Nemean Lion but it was hard to tell which creature was going to be the toughest to kill.

They were lucky to use the new arrows that were given to them. The arrowhead is made out of Imperial Gold and Celestial Bronze induced with a bit of magic. It was supposed to be strong enough to kill the Turtle Gurongi but it still wasn't enough. Instead of trying to kill the monster, they started removing his weapons. They shot his rings off his fingers making sure he can't make another ball-in-chain.

"Thaila!" A voice shouted.

The Hunters turned to see Percy in his Kuuga based form riding his Try Chaser which was armored by Gouram.

"Percy?" Thalia was shocked to see him. "Shouldn't you be resting?!"

"I'm fine! Just get out of the way!" Percy said.

The Hunters got out of the way as Kuuga rammed TryGouram into Gamego. Gamego was on top of the bike as Kuuga drove farther away from the Hunters. Until he was sure he was far away from the girls, Kuuga stops his bike sending Gamego flying into the abandoned building.

Kuuga hop off his bike and went to find Gamego, before he could even start but was charged at by Gamego. Kuuga dodges to the side and tries to kick him but is blocked and has Gamego grab hold of Kuuga's waist and push him forward. Kuuga held his ground as he elbowed Gamego's shell multiple times before finally kneeing the Gurongi in the stomach making the Gamego let go. Kuuga tried to knee him again but Gamego caught his leg and lifted the red warrior and threw him over his head. Kuuga crashes onto a pillar.

Kuuga gets back up and ready himself. Gamego charged forward ready to kill Kuuga. As Gamego got close, Kuuga punched him causing him to be unbalanced then kneed him in the stomach before finally giving the Gunrongi a hard power punch sending him meters away.

Gamego gets up as both figures stare at each other.

Kuuga crouched to his kicking position and allowed his body to begin to collect the energy within him to give himself new power to beat Gamego. Golden lightning was surrounding his belt and into the body as his armor was changing. Kuuga's Mighty Form change with the red armor stayed intact but with golden outlines similar to his other Rising Forms. He gained a gold shin guard on his right leg called the Mighty Anklet and with his red eyes glowing. Kuuga was now in his Rising Mighty Form.

Go-Gamego-Re held out his arms ready to face the kick head-on. The Gurongi survived the red warrior's other attacks; he knew he survived this one.

Kuuga then set off as he charged forward against Gamego, lightning crackling off Kuuga's right foot as he left fiery footprints from each step. As he finds himself within range Kuuga leaps up and does a front flip before setting his right foot out aiming at the Turtle Gurongi's chest. His fiery kick collided with the monster's chest, pushing the Gurongi back.

"[Damnit…]" Gamego grunted before exploding into a huge fiery 3000 meters radius explosion as Kuuga just stood there engulfed in the explosion.

~/~

As Percy defeated Gamego, he was being watched by the Olympians. They were curious when Perseus first got the Arcle. They never heard of the warrior called Kuuga and had to pull strings to ask the Japanese Pantheon about this warrior once they learned the warrior was originally from Japan. They let Percy fight these Gurongi, and die while fighting but somehow able to be revived, much to Hades's disbelief. But what caught their attention was how Percy was getting stronger and this confrontation with Gamego just proves their worry, except for Poseidon.

"You're a fool to think my son is a threat!" Poseidon shouted at Zeus.

"Don't you see the power he's getting, he's getting stronger by the minute!" Zeus shouted back.

"The boy has been getting more destructive with his kills," Demeter commented.

"There is Darkness surrounding the boy," Hades added.

"Do you truly believe he's still stable?" Athena asked the Sea God.

"I believe Percy will stay on the right path. His fatal flaw is loyalty, it is good and love in his heart he won't be corrupted and turn on us." Poseidon says.

"Uncle is right, that boy is loyal to the fault and rather sacrifice himself then let anything happen to his home and to his friends and family." Artemis agreed.

"Hmph, fine we'll see this play out, and when that boy finally snaps, I will end him." Zeus glared at his brother.

Poseidon just glared back and held onto his Triten tightly. He believes in Percy after all his mother raised him right. Percy is a hero and that's never going to change.

AN: I thought of trying with American characters also to King Of 2211 I don't think I'll use western cartoons because I just don't see the connection with them. Why I chose PJ well I thought with something ancient like Kuuga it could work. And yes he will say henshin I'm working on the reason why he has to say it. Hey, 'Henshin' sounds way cooler than 'Transform'. And if anybody is wondering yes I am working with a PJ/KR Aqua one-shot.