Disclaimer: This is an alternate adaptation of Gokaiger with a bit of an alteration of Goesiger's adaptation as well. I do not own Power Rangers or Super Sentai, and all of this is just my way of adapting Gokaiger.
On the planet of Emidia lives the Master Ranger, the physical embodiment of the morphing grid. They would be the creator of the ranger keys, which are a fail safe plan if rangers need their powers in future powers after their powers are inactive after a certain amount of time. So to protect these powers from falling into the wrong hands, he create a team of rangers to protect the planet and the ranger keys This team is made up of human looking aliens on the planet, and they become the Power Rangers Ultra Guardians. The War Star Bugs would try to fight to take the keys for themselves, but would fail and would be defeated, and the planet was at peace.
However, a traitor in the team gave up information to the powerful new enemy, and this information allows them to invade and overwhelm the Ultra Guardian team. This enemy, the Armada, has taken over many other planets. The red ranger, Charlie Greystone, was forced to leave his planet after losing his own, along with the ranger keys he was suppose to protect. The Master Ranger would revert to it's original form, the morphing grid, and Charlie would then become a pirate, trying to sabotage the Armada's plans of total conquest, which led him to Earth.
So now, he is searching for the ranger keys along with assembling a pirate crew ranger team to fight along side him to defeat the Armada. But this journey will not be easy, and this is the show of a lifetime.
You don't know how or why, but you've been isekai'd into the world of Jujutsu Kaisen. Although your first instinct is to stay far away from the plot, you've been blessed with an abnormal amount of cursed energy, and for better or worse, you find yourself sucked into the storyline. You decide that you may as well use your newfound powers for the greater good, and if you're lucky, you might succeed in rewriting some of the characters' fates. But it turns out that your presence in this world is even bigger deal than you first thought, and soon, everyone wants to make you theirs.