Kamen Rider Gaia

Plot:
When an evil band of pirates from another dimension attack the city of Royal Woods, The Loud family must stand up to them and save the world. But first, they must overcome internal bickering, fighting and rivalry, and work together as a team. (Note: This takes place in the Rabbit universe, not the normal Loud House continuity).

The 26 Riders:

 * Kamen Rider Gaia/Warren Loud
 * Kamen Rider Commander/Betty Loud
 * Kamen Rider Cassiopeia/Beverly Loud
 * Kamen Rider Jewel/Blair Loud
 * Kamen Rider Wrath/Brenda Loud
 * Kamen Rider Rocker/Barbara Loud
 * Kamen Rider Spirit/Bodhi Loud
 * Kamen Rider Joker/Bebe Loud
 * Kamen Rider Jack/Bippa "Bip-Bip" Loud
 * Kamen Rider Ex-R/Bailey Loud
 * Kamen Rider Shadow/Bella Loud
 * Kamen Rider Liar/Jewel/Bernadette Loud
 * Kamen Rider Cowboy/Beulah Loud
 * Kamen Rider Tactix/Beatrice Loud
 * Kamen Rider Medic-O/Blanch Loud
 * Kamen Rider List/Bethany Loud
 * Kamen Rider Chef/Brie Loud
 * Kamen Rider Luck/Bernice Loud
 * Kamen Rider Ex-R Proto/Bertha "Big B" Loud
 * Kamen Rider Panic/Brooke Loud
 * Kamen Rider Artist/Bianca Loud
 * Kamen Rider Heart/Belinda Loud
 * Kamen Rider Chapter/Ryuki Jr./Knight Jr./Scissors Jr./Zolda Jr./Raia Jr./Gai Jr./Ouja Jr./Tiger Jr./Imperer Jr./Odin Jr./Verde Jr./Femme Jr./Ryuga Jr./Zero Jr./Abyss Jr./Birdie Loud
 * Kamen Rider Somni/Beth Loud
 * Kamen Rider Neo/Brandy Loud
 * Kamen Rider Messenger/Bridget Loud

Other Good Riders:

 * Kamen Rider Tremor/Daniel "Danny" McBride
 * Kamen Rider Hope/Jade
 * Kamen Rider Accele/Samuel
 * Kamen Rider Star/Marc
 * Kamen Rider Phaser/Wick
 * Kamen Rider Peace/Cameron

The Contract Monsters/Contractors:

 * Geophoenix
 * Garudoscream
 * Lightwing
 * Sparkspider
 * Grizzrage
 * Hyperabbit
 * Dovewinger
 * Jestroid
 * Skyhawk
 * Cheetacide
 * Blackwing
 * Stingstrike/Stingmouser 1
 * Diamamouse/Stingmouser 2
 * Hoofstrike
 * Megachine
 * Mosquitron
 * Hypercameleo/Septecon 1
 * Tigergrowl/Septecon 2
 * Whalephoon/ Septecon 3
 * Toadstoolcon/Septecon 4
 * Rhinodrill/Septecon 5
 * Wispraven/Septecon 6
 * Lobstrox/Septecon 7
 * Chefslicer
 * Mantibladez
 * Kickkanga
 * Evildreamer/YinYang-Oh 1
 * Heaveneo/YinYang-Oh 2
 * Hexcubis
 * Dovesyncher
 * Wingclaw
 * Koalamare
 * Utopicon
 * Celltrix

The Renegade Marauders:

 * Ravecon
 * Skyria
 * Beastcrash
 * Elephantius
 * Narhlwarrior
 * Toroshio

The Junior Mirror Monsters:

 * Dragreder Jr./Dragranzer Jr. (Mirror-O 1)
 * Darkwing Jr./Darkraider Jr. (Mirror-O 2)
 * Venosnaker Jr. (Genocider Jr. 1)/(Mirror-O 3)
 * Magnugiga Jr. (Mirror-O 4)
 * Gigazelle Jr. (Mirror-O 5)
 * Volcancer Jr. (Mirror-O 6)
 * Metagelas Jr. (Genocider Jr. 2)/(Mirror-O 7)
 * Destwilder Jr. (Mirror-O 8)
 * Evildiver Jr. (Genocider Jr. 3)/(Mirror-O 9)
 * Blancwing Jr. (Mirror-O 10)
 * Dragblacker Jr. (Mirror-O 11)
 * Biogreeza Jr. (Mirror-O 12)
 * Abysshammer Jr. (Abyssodon Jr. 1)/(Mirror-O 13)
 * Abysslasher Jr. (Abyssodon Jr. 2)/(Mirror-O 14)
 * Psycorogue Jr. (Mirror-O 15)

The Marauder Resistance Force (MRF):

 * Captain Justin Tyler "J.T." Warner
 * Lt. Amy Yeung
 * Professor Wilson Whizpopper
 * Sergeant Russell Parker/Garuda Pirate (Skywinger)
 * General Justus "Madman" Maddow
 * Private Dennis DeCosta
 * Private Richard DeCosta
 * Commander R
 * Riotroopers (Gaia)
 * Elite Riotroopers

The Marauders:

 * Captain
 * Yukira ("Snow Tiger" in Japanese)/
 * Aeros
 * Quakeshaker/Dobson
 * Dashhop
 * Boomerage
 * Seven Shot
 * Blotout/Flynn
 * Dynamia/Azira
 * Tacticon/V3-R8
 * Left Striker/Dash
 * Right Slasher/Twist
 * Geniocat/Petey
 * Hyperbot/80-HD