Kamen Rider Virtune is brought to you by
this person right here!GAME SET!! START!!A videogame company called MIST is developing a new videogame that uses hi tech VR technology to temporarily convert real life matter into Virtual Fields where virtual blocks can be used to create a more realistic environment for players. Unfortunately an accident caused the VR engine to overload and cause a giant V-Field to form around the city. Normally the field is harmless and unnoticeable to humans without the proper equipment but every now and then creatures called "Entities" which are modeled after the supposed enemies in the game emerge from the field. To combat these, MIST and the local government formed a small organization called AGNIS (Advanced Generation of Network and International Security)which uses state of the art weapons to protect the safety of the public.

Fighter Mode (fighting games)
Virtunes base form its pretty versatile stat wise but doesn't come with weapons so the lower corner buttons do nothing and the elements are instead fused to the fist and the feet.
Fantasy Mode (RPGs)
More durable than fighter mode but is a bit slower. It also comes with several weapons : Levelblade, Levelax, Levelspear, Levelstaff (the one that looks like a flail). True to its theme the Fantasy mode requires the user to get her a** handed on her first as the mode scans the enemy movements and gets stronger the longer the battle last (it still has its limits though)
Shooter Mode (FPS)
Intended for long range combat this form comes with the Blitzmagnum a hi power pistol, Blitzcannon a long range rifle and the Blitzmachgun a machinegun it also comes with a set of grenades as one of its skills which can be used alongside the other weapons. Too bad the main character has extreme motion sickness hehehe
Puzzle Mode (puzzle and mind games)
Probably the least powerful in terms of offensive strength and serves more as support. The Puzzle mode is capable of creating snare traps, mazes and illusions etc. to confuse its enemies. Whatever it creates stays as long the Virtune Core wants to and can still be used even if the user changes form. Therefore this form is ideal for setting up ambushes with the Shooter mode or creating makeshift dungeons for the Fantasy mode.
Mid Season upgrade : Virtune Velocity Mode (racing games)
A form dedicated to fast paced combat Velocity mode allows Virtune to move up to the speed of sound. Although to activate this form Virtune has to first switch to and stay using the Fire attribute set because this mode uses fire for the majority of its attacks and its boosters. Using this form while in another attribute will either cause the form to not work (ice), do nothing and simply turn the armor into dead weight (wind/base) or damage herself (thunder). Like the fighter mode, this form doesn't come with weapons but who needs them when you have flamethrowers and rocket powered punches and kicks. The boosters also allow Virtune to fly and hover for short distance but drains energy at a faster rate.
Final Form: Virtune Victory
Virtune’s final form accessed using the Victory Cartridge which was in turn created from the stolen design notes of the Monarch driver courtesy of Kamen Rider Rygar(tertiary rider) who just had a heel-face turn.
Victory Mode requires her to gather a large amount of V-blocks (either from converting matter, defeating entities or are provided by AGNIS) and use it to transform V.V into the Victory Core ( which turns her gold) before inserting the Victory Cartridge.
Victory mode gives Virtune an incredible boost in stats as well as give her the ability to generate a private V-field that can override weaker ones allowing her to manipulate matter and physics within the area. Thanks to AGNIS’s science team, Victory mode allows Virtune to use any weapon or ability from other cartridges. But her most powerful weapon are the Victory Bracers attached to her arms which function as both a shield, a laser blade projector, a blade shooter or simply as something to smash into enemy faces.

Virtune's most powerful form and is also the most dangerous. This form is the result of Virtune fusing with the Legendary Entities. Akatsuki the Fighter Entity, Luciel the Demon King Entity,Mystel the Goddess Entity, Morphes the Mystery Entity, remaining fragments from Colbine the Hitman Entity andEngiro the Vehicle Entity and after that Shiren Daimon, AGNIS's chief in command who was revealed to be the Spider Entity who was one of the original 2 entities and is the Bat entity's younger sister (who also had her own savings of V-fragments)
This form is capable of field conversion just like Thanatos and is armed with 8 tentacle-like wings (from the spider entity) which she can use to attack, defend or absorb matter to power up herself.
Because of its overwhelming power, V.V. is forced to focus on holding back and managing the flow of energy making sure it doesn't kill them leaving Junko to be the one doing the fighting by herself. And the even with that they can only use the form for a total of 5 minutes. Using it for longer would cause the energy to go haywire and kill them both.
Its Finisher is the Legendary Virtune Arrow where Virtune spreads out her wings to absorb V-fragments to power up one final Rider Kick.

The Secondary Rider of Kamen Rider Virtune
Kamen Rider Axess is Takuya Yuuki, Aiko/V.V's younger brother who now works for AGNIS alongside his twin sister Sakuya.
Just like the Virtune suit, the Axess suit was originally made to be used by either Takuya (using the shooter mode) or Sakuya (using the fantasy mode). The initial plan was to let Takuya have the Virtune suit since he goes on hunts more often while Sakuya gets the Axess suit as soon as AGNIS finish making it and after running a few test on the first belt. Because a few unexpected occurences such as Junko's intervention, arrival of Monarch's rider etc. AGNIS was forced to speed up the creation of the Axess suit and ditch the A.I for Takuya to use as soon as possible.
Shooter Mode
The Axess suit is similar to the Virtune suit in terms of power, the only difference being the pilot's fighting style (Takuya uses guns, Junko/V.V prefers their fist, Sakuya with swords) thus through Takuya's suggestion the suit was given cartridges that have emphasis on long range combat. Despite being a rushed down project, AGNIS managed to throw in a few more stuff for the shooter mode such as a new set of weapons the Blitzcleaver (a gunblade), Blitzeagle (pistol),Blitzbuster (grenade launcher) and Takuya's favourite the Blitzscope ( a sniper rifle) and the ability to summon 2 weapons at the same time and dual wield them (dualwielded grenade launchers anyone?)
Artillery Mode
A form that boast incredible firepower. The Artillery Mode is the result of AGNIS employees experimenting with other stuff just trying to see what works. Most exclusively made for LONG RANGE combat, this form can use either a pair of folding cannons , a pair of gattling guns or a pair of homing missile launchers which in theory could rip apart even high ranking entities. It's also capable of changing the elements of its ammunition making it even deadlier.

The Tertiary (foe-to-friend) Rider of Kamen Rider Virtune
As you see he has a some sort wolf motif. Rygar (Raiga Endou) uses a customized belt which was created from an unfinished V-driver stolen by one of MIST's rival companies. It, alongside the Encore suit were made as test models after the failure of the Rage suit. Unlike the Virtune Driver, the Rygar driver uses a built-in core which cannot be detached, and is incapable of changing forms. Instead, cartridges only give Rygar the weapons/ some abilities associated with it. Despite its minor drawbacks, the Rygar suit is naturally stronger, faster and a lot more agile than the Virtune suit and it is calso capable of turning the boosters on its back into a set of arms with claws which already probably speaks for itself.

The first main antagonist of Kamen rider Virtune
Monarch is Daigo Ouma the president of Monarch Enterprises a rival company of MIST.
The Monarch Driver is the result of reverse engineering a stolen V- Driver along with the data taken from the Rage,Rygar,Encore and Chronos suits.
Like the other pirated cores, the King's Core is fixed to the driver and is incapable of form changing but this form boasts incredible amount of power,flight, teleportation abilities, and super speed. It also comes with a really big a** sword which can be controlled at a distance ala darth vader and is capable of splitting into two. But its most dangerous skill is the ability to generate his own private V-field (similar to what V.V. uses ) that can override weaker fields and allow Monarch to manipulate matter and physics within the area. It can also concentrate his field to form a barrier that is equivalent to a rider sized AT- field.

The Final Boss of Kamen Rider Virtune
The villain of the story's final arc. Thanatos is Seichiro SuzukiAKA Kamen Rider Chronos after revealing himself to be the Bat Entity one of the 2 original entities and is the one responsible for the accident that created Virtual field surrounding the city.
After abandoning his newborn sister, he killed the original Suzuki and mimicked his appearance to gain more knowledge about humans and the V-field. He adopted the orphaned Nao and experimented on her turning her into a psychopathic super soldier. Manipulated Daigo into funding his research promising to revive his dead wife as an entity while having Nao capture entities to experiment on. Blackmailed Raiga who was raising a trio of child entities into kidnapping his "girlfriend" Sakuya promising protection from AGNIS and used her as a test subject. Secretly assisted the Hitman Entity and the Vehicle Entity in their plan to defeat Virtune. Caused the death of a few AGNIS agents after using them to test Encore's upgrades. Later betrayed Monarch after Virtune defeated him. After being defeated as Chronos by Takuya and Raiga destroying his belt and after Virtune defeated Encore, he revealed his true form and killed and ate the heavily battered Nao (who was actually happy to "help" her dad) and took her belt, and used it with the belt core he made with the V-fragments he's been saving up for years transforming into this. And the best part, it all part of his plans .....Yeah.. this guy was both savy and badass.
As an original entity, Thanatos is a master of field conversion, turning matter, people and other entities into V-fragments and absorbing them to power up himself. He is also capable of creating thousands of clones of himself (via copy paste) and using them to attack,defend ,convert and absorb even more stuff.
Thanatos is ridiculously powerful. He can beat Virtune, Axess, Rygar in their final forms without breaking a sweat. Being based on the Chronos suit, he is also really fast and is capable of levitation and teleportation.
His finishers are:
Dead End Destroyer- where he releases a surge of pulsating energy in all directions and absorbing what is left.
Dead End Devastator- His strongest attack. He slowly levitates while firing a barrage of clones doing Rider kicks at the enemy like a machinegun finishing it with his own charged Rider Kick.