X factor

X - Factor is a crossover RPG game starring characters from Nintendo and Playstation, with some original characters as well as guests.

Gameplay
The battle system is called the Active Battle System.

Most of the characters fight solo, but there are also characters who act in duos fashion.

The game also features the Support Hit and Cross Hit, which involves a fellow party member or nearby allies' proximity. With it, players are allowed to attack one enemy with five characters: a pair unit, a solo unit, and a nearby pair unit to inflict massive damage. Cross Hits also bind the enemy in place so that essentially none of the characters' attack ever miss (though this is dependent on where the enemy is specifically locked).

Bonus experience is added to the unit's total depending on the number of critical hits, cross hits and overall number of hits landed. A further bonus is granted if the Pair unit's finisher move annihilates the target.

Nintendo
Link (Legend of Zelda)

Red (Pokemon) 

Isaac (Golden Sun)

Garet (Golden Sun)

Marth (Fire Emblem)

Lyn (Fire Emblem)

Mario (Super Mario Bros)

Buddy (MySims)

Playstation
Red Knight (Fat Princess)

Sackboy (Little Big Planet)

Sackbot (Little Big Planet 2)

Nathan Drake (Uncharted)

Rikku (Final Fantasy X)

Lulu (Final Fantasy X)

PaRappa the Rapper (PaRappa the Rapper)

Guests
Natsu (Fairy Tail) - Wii only

Lucy (Fairy Tail) - Wii only

Goten (Dragon Ball Z) - Playstation only

Kid Trunks (Dragon Ball Z) - Playstaion only

Megaman (Megaman)

White Bomber (Bomberman)

Original
Franz Aragon - A samurai in the Aragon family's past.

Phoenix Aragon - A gunman in the Aragon family.

Maul Aragon - A doctor in the Aragon family.

Tiffany Batcher - A Priest with holy magic.

Stephanie Powers - A Mage that can create weapons from her own energy.

Nintendo
Nana and Popo (Ice Climbers)

Ness and Lucas (Earthbound)

Playstation
Blue Mage and Blue Priest (Fat Princess)

Zer0 and Axton (Borderlands)

Guests
Sakura and Naruto (Naruto) - Wii only

Kohto Hirano and Saya Takagi (Highschool of the Dead) - Playstation

Sora (Kingdom Hearts)

Characters (Extras list)
Brock Clive Handforth Da Vinci Dante Aragon Eirika Fat Princess Gohan Goku Gray Happy Ike Luigi Megan Aragon Mia Misty Pink Bomber PJ Berri Pokemon Trainers Polar Bear Princess Peach Roll Sackgirl Sims Toad Toon Link Toon Zelda Yuna Zelda

Nintendo
Giga Bowser

Ganondorf

Felix

King Dedede

Ridley

Dark Samus

Playstation
Negativatron

(Sackbot Army)

Sephiroth