Virtual World is an archetype that is found in Cyber-City Guardians that is focused around Synchro and XYZ summoning and the focus is to set up the graveyard for its many possible plays. All of the main Virtual World monsters require another face-up Virtual World card to activate and resolve so play sequencing is essential as this deck is very unforgiving if you make poor mistakes. As of writing currently the reason why people gravitate towards this deck is that it can easily make True King of all Calamities and has a strong yet recursive boss monster in Virtual World Kyubi - Shenshen. Another reason why this deck is really well liked is that Virtual World's biggest strength is the strong toolbox of XYZ and Synchro monsters this deck can access. Lastly, Virtual World is one of the best Decks at managing their resources, as they have the tools to easily recycle their cards back with their powerful effects.
Virtual World Mai-Hime - Lulu, Virtual World Kirin - Lili, Virtual World Roshi - Laolao, Virtual World Xiezhi - Jiji x3
These 4 monsters must be played at 3 copies each as it gets your deck started. These monsters all have the effect to target another face-up Virtual World card you control, after that you send a Virtual World card of a different type from your deck to the graveyard then summon the monster and then lastly each of these monsters has their own unique effect.
For Lulu, you can add a Virtual World card from deck to hand of a type that was not chosen to activate Lulu nor of a type sent to the graveyard. I’ll list some examples of what I mean. If you target a monster for Lulu’s effect and send a trap to summon Lulu, you can search for a Spell. Similarly, Lulu target’s a trap, sends a spell, and you can search for a monster. Another case would be Lulu target’s a spell, sends a monster, and searches for a trap.
For Lili, you can send a Virtual World card from the deck to the graveyard of a type that was not chosen to activate Lili nor of a type sent to the graveyard. Examples will be shown again. If you target a monster for Lili’s effect and send a trap to summon Lili, you can send a Spell. Similarly, Lili target’s a trap, sends a spell, and then you can send a monster to the graveyard. Lili is essentially a double Loading... .
For Laolao, you can special summon another Virtual World monster from your graveyard. This helps you with extension or coming back from behind in further turns. A common use for Laolao’s effect is to send Loading... from the deck to the graveyard, then reviving a level 3 monster, which immediately triggers Nyannyan’s effect to revive itself, essentially special summoning it from the deck.
For Jiji, this card allows you during the End Phase to add any Virtual World monster from the graveyard to your hand. Common targets include Lulu or Laolao. This card is important for maintaining your card advantage from your first turn onwards.
Virtual World Hime - Nyannyan x2
This card doesn’t help you start your plays but it helps you further extend your plays. This card can recur itself from the graveyard when another Level 3 monster is summoned to your field but it gets banished when it leaves the field. However, if Nyannyan gets banished, you can return another banished card back into your deck. This works for facedown banished cards as well. Common targets for Nyannyan are usually cards banished by Loading... or Extra deck monsters that are not Virtual World cards, including Loading... .
Virtual World Oto-Hime - Toutou x0-1
Toutou is a niche pick for Virtual World strategies, however, it can somewhat help with extending your plays. Usually not needed. It being a Wyrm EARTH monster can potentially help playing around floodgates such as Loading... or Loading... , since it can be a tuner.