1993-2000
Mostly cannon seasons with some mild character and terminology adjustment. If anyone is interested, I can elaborate.
2001: Guardian Power Rangers
At a progressive arts school in a developmental suburb bordering wildlands four high school students encounter an off-world teen on the run from an invading force. Reluctantly recruiting the earthlings, Ryden of Promethius charges them with finding and protecting his planet's missing Heir, the only thing that protect his planet and ours or doom it forever.
Adaptation: Hikari Sentai Maskman
2002: Power Rangers Wild Force
Chamberlain Prepatory School gets new students. Having met over the summer at Pai Zhuq school, five teenagers decide to attend the Prep, which borders a wild game reserve. While trying to find a place to train together in the game reserve, these five teenagers discover Animaria; the realm of Wild Zords, and an ancient battle between the people of the Animarium and the Org.
Adaptation: Hyakuju Sentai Gaoranger
2003: Power Rangers Fire Storm
On a quest to recover legendary ninja scrolls, four young ninja cadets are transported to a world where technology and ninja skills rule. With mentorship under the legendary Ninjor, these young ninjas must face evil ninjas and set this world free.
Adaptation: Ninpu Sentai HurricanegerNotes: Ninja Storm/Original
2003: Power Rangers Ninja Storm
Three rebellious students are the last ones remaining at their ninja academy after evil aliens attack the Earth. To save the world, their ninja master teaches them to harness ancient mystical energies that transform them into Power Rangers.
Adaptation: Ninpu Sentai HurricanegerNotes: No deviation.
2004/2005: Power Rangers Alpha / Beta
The Power Coins are out there, broken, waiting for their other halves. When Roki and Zita Repulsa take residence in the Palace on the Moon in attempt to make up for their parents' defection to Good, six ordinary young people find themselves in the middle of a Z Putty attack. They become Power Rangers. It is then up to them to find comeplete the other halves of their coins and defend the world against Evil. With an Evil Ranger in the beginning, the original Mighty Morphin' Rangers as mentors, and an android girl built by Alpha 5, join the new Alpha Rangers as they prove themselves worthy of being Power Rangers.
Adaptation: Original/Sequel
2006: Power Rangers Civil War
The Astro Morphers have been stolen by the new authoritarian government of KO-35 and Zhane is missing, presumed dead. Andros leads those who oppose this insidious new regime to safety after being labeled as traitors, begins establishing a rebellion. Astronema's clone Remi has undertaken a mission to find a mysterious power to help, but ends up recruiting new Rangers on Earth, including familiar faces and brand-new ones. But this isn't a battle for Earth. Remi and the new Mega Rangers lead by AJ Scott along with Karone and her infant must head to the KO system to fight for the freedom of KO-35 and its entire civilization.
Adaptation: Kaizoku Sentai Gokeiger
2006: Power Rangers Mystic Force
Planet Earth is living in a time of peace when quiet serenity is shattered under attack from a new evil... It is then that five daring young people learn their true identities - heroes entrusted with mystical powers destined to defend the Earth as Power Rangers Mystic Force.
Notes: No deviation
2007: Power Rangers Mirinoi Chronicles
After successfully defending Earth as a Beta Ranger, Melody Robinson is summoned to Mirinoi as a new evil looms, seeking the power to take over the planet. Joined by Rex Hart a new team of Quasar Rangers must band together to defend the planet and the Earth colony, Terra Venture.
Adpatation: Tokumei Sentai Go-Buster
2007: Power Rangers Operation Overdrive
The five jewels of the powerful Corona Aurora were spread throughout the Earth to prevent Moltor and Flurious, who were cursed for seeking it, from possessing it. Five young adventurers are recruited by the wealthy treasure hunter Andrew Hartford to become the Power Rangers to protect the Earth.
Adaptation: GoGo Sentai Boukenger
Notes: Recasts and some story changes
2008: Ninja Academy Power Rangers
A master of the Shadow Arts is attempting to build an army of Shadow Ninjas by kidnapping children to train. The Wind Ninja Academy must team with the Thunder and Fire Academy to defeat an evil that threatens the future of their secretive schools.
Notes: Sequel/Original
2009: Power Rangers Jungle Fury
Three young people are selected to protect the world from the evil Dai Shi, who had escaped from his imprisonment and possess the body of their former schoolmate. They are trained in Pai Zhuq which allows them to release powerful animal spirits. They join forces with former students earning their own Master's Stripes.
Adaptation: Juken Sentai Gekiranger
Notes: Cast and story changes
2010: Power Rangers Samurai Clash
The 17th Shiba Lord has died leaving the world unprotected from a dimension of evil beings intent upon flooding the Earth with its evil waters. A new Lord Shiba has been chosen and he assembles a team of Samurai Rangers to prevent the Earth from being consumed by the Sanzu River.
Adaptation: Samurai Sentai Shinkenger
2011: Power Rangers Delta Prime
This tale has been pilfered from Royal Road. If found on Amazon, kindly file a report.
Doggy Cruger has spent years establishing a command post on Earth and training Space Patrol Delta's first Power Rangers. Join Tate and a cast of familiar faces as the Prime Rangers kick off a tradition of Power Rangers that will last for the next fifteen years and beyond.
Adaptation: Mirai Sentai Timeranger
2012: Dynamic Power Rangers
An R&D company called Astral Dynamics has found an ancient alien base, long hidden over the city of Starkweather Valley. As they research the cache of Morph Tech they discovered, aliens known as the War Stars begin to attack. the Dynamic Power Rangers are activated to defend the Earth from these invaders.
Adaptation: Tensou Sentai Goseiger
2013: Power Rangers Undercover
On the trail of an intergalactic band of thieves, Galamatias Special Police Officer Firhani and his partner come to Earth and recruit local talent to help them track down this band of brigands. Armed with the ability to morph into two different Rangers, the Rangers hide their identities as law enforcement officers and continue to bring the criminals to justice.
Adaptation: Kaitou Senati Lupinranger vs. Keisatsu Sentai Patranger
2014: Power Rangers Rail Rescue
The Rail Rescue Academy is an interdimensional policing force that uses trains for mecha. It utilizes an academy system similar to SPD's. It's located in a separate dimension than our known Terrestrial Dimension. Something strange has happened recently. Kite's father, who was in charge of the Academy has died and no one has answers to his questions about what really happened. Right after completing training, Kite goes AWOL in order to find his twin sister and mother who live in the Terrestrial Dimension. He plans to infiltrate his sister's school in order to stay close to her and protect her. But, it seems he's been discovered and gets chased by his own people. The fact that he stole the Morphers may have something to do with that, but he couldn't trust his own people anymore. They chase him and he finds his only safe haven is Mirriman College of Open Minds, a small, mysterious campus comprised of many special students. He'd only just reunited with MoMo, with Rail Rescue officers on his trail when the Shadowline tries to take over the town where the college is located. Kite must recruit several students in order to deal with the threat. Eventually Kite connects with an old ally of his father's, the headmaster of the Mirriman College, and begin their defense of Earth in earnest.
Adaptation: Ressha Sentai ToQger
2015: Power Rangers Dino Charge
New dangers threaten the Earth and it's up to Rena Hart's music class to save the world! When newly developed Morph Tech falls into the wrong hands, now retired, teaching music and trying to start her music career, Rena Hart find out students in her classroom have become Power Rangers and it's up to her and Taylor Hicks to guide them to victory.
Adaptation: Zyuden Sentai Kyoryuger
Notes: Original Story and Cast
2016: Power Rangers WindStorm
Taylor and Rena's students have decided to follow the path of the ninja, but when an enemy from Taylor's past begins to threaten Earth's atmosphere and every living thing, they must don the Cyclone Ninja Suits and become Power Rangers once more.
Adaptation: Choju Sentai Liveman
Notes: Motif/Design inspiration
2017: Power Rangers GEO-Beasts
Nyo and Divya Kotze have built a virtual reality gaming system in their back yard. One day while debugging after a beta-test, they watch a meteor shower. A perfect storm brews. A meteor hits their workshop, and attracts lightning strikes, which tears a rift in reality, freeing elements of the game in the real world, including te villains. A rival game developer learns of this and finds a way to harness the game's villains for his own gains. Now Nyo and Divya must use the power of the world they accidentally unleashed to protect both realities while trying to figure out a way to close the rift.
Adaptation: Doubutsu Sentai Kyuohger
2018: Power Rangers Ninja Fury
A girl kidnapped on a planet far from ours. When the culprits come to Earth to summon a creature of equally extreme power, Dex Ro and his family come to Earth to find their daughter and stop the plans of the Strange Clan to summon a great power. To do this, they recruit a new team of Power Rangers.
Adaptation: Shuriken Sentai Ninninger
2020: Power Rangers QSO
A mismatched group of aliens, humans, and non-terrestrials are assembled to to protect Earth and other worlds from evil. A syndicate from another galaxy is eying ours to power their war empire and their ability to bleed through time and space. Kit Ro, Neri Meridian, and Kamad Ravi have all faced this enemy and with the help of the QSOs and the mysterious Spyro, are able to stop their planets from having their living energy, Qiyu, harvested. When the Syndicate eyes Earth, and Spyro away on a different mission, they try to protect the planet themselves, but they weren't expecting such a powerful foe this time. A battle above the planet is fought to a draw and the trio must take shelter on the planet below. Watching through a telescope is Topher Grant, who soon finds himself and a classmate, Laiken Thorpe, embroiled in the quest to protect the Galaxy. With more QSOs out there, more members are added to their team of space-faring Power Rangers.
Adaptation: Uchu Sentai Kyuranger
2021: Amazing Power Rangers
A new enemy threatens the safety of mankind. Topher Grant, Arya Wyndesong, and Laiken Thorpe team up with new faces and empowered with Amazing new powers must now protect Earth.
Adaptation: Mashin Sentai Kiramager
2022: Power Rangers Dino Guard
A dance competition gone awry. New Power Rangers are made by combining the power of two worlds to face a new foe threatening the Earth.
Adaptation: Kishiryu Sentai Ryusoulger
2025: Power Rangers S.P.D
Under the command of Anubus Cruger, a highly trained unit of police, the Space Patrol Delta, or S.P.D., has been formed to keep the peace. Five heroes are united together to serve and protect the galaxy as the Power Rangers S.P.D. - against the evil Emperor Gruumm, the commander of a battle spaceship.
Adaptation: Tokusu Sentai Dekaranger
Notes: Some lore changes, otherwise relatively intact
2030: Project Omega Power Rangers
The Omega Ranger's futuristic technology has been replicated in the present and a new team forms around it. Omega Ranger, Sigma Ranger and Zeta Ranger form an elite Fugitive Retrieval Unit. They must track down, defeat and capture some of the evilest villains the galaxy has ever known.
Adaptation: Adaptation: Tokusu Sentai Dekaranger
Note: Sequel/Original
2031: Power Rangers Mystic Knights
An attempt to open a portal to a closed off part of the Mystic Realm, known as Tir Na Nog, in Ireland by the newest Guardian results in disaster. Not only is the way to Tir Na Nog not opened, but the Isle of the Lost has been freed instead. Three youth from the Terrestrial Realm are stranded inside. They must now protect Tir Na Nog and all magick and find their way home.
Adaptation: Gosei Sentai Dairanger
2032: Power Rangers RPM
A computer virus known as Venjix has been released into the world. It is attempting to take over the world's communication, power and defense systems. It has already taken over a research base and created automatonscalled Grinders and other advanced robots to do it's dirty work. To stop this threat, Dr. K creates a new team of Power Rangers to protect the world and defeat Venjix.
Adaptation: Engine Sentai Go-Onger
Notes: Cast and Story Changes
*I'm still developing the years between Dino Guard and S.P.D.