Neo-Spacian

"Neo-Spacian" ( Neosupēshian) is an archetype related to the "Elemental HERO" archetype which focuses upon an unusual form of fusion with "Elemental HERO Neos". The "Neo-Spacians" and their infant form, "Chrysalis", were introduced by Jaden Yuki in the Yu-Gi-Oh! GX anime, who created the concept of these cards when he was a little boy. There are six Level 3 "Neo-Spacians", each with a different Attribute and Type. This theme relies on "Elemental HERO Neos" and was designed to give Jaden an alternate strategy to his Deck.

While the Japanese name of "NEX" is and would appear to be part of the archetype, it is not considered a Neo-Spacian card due to different superscripting.

Traditional Neo-Spacian
Unlike most Fusion Monsters, which must be Fusion Summoned, "Neos" Fusion Monsters are instead Summoned via Contact Fusion, which only requires the Fusion Materials to be on the field. However, the "Neos" Fusion Monsters also have an effect that returns themselves from the field to the Extra Deck during the End Phase. To avoid this, the Field Spell Card "Neo Space" allows the Fusion Monsters to stay on the field as long as "Neo Space" does, and the Equip Spell "Instant Neo Space" allows the equipped Fusion Monster to stay on the field (as well as allowing the Special Summon of "Elemental HERO Neos" when the equipped monster leaves the field). The Monster Card, "G.B. Hunter", can also prevent the final effect of the "Neos" Fusion Monsters from applying, but will also stop further Contact Fusions. There are the 6 primary "Neos" Fusion Monsters, 3 Summoned by Triple Contact Fusions ("Magma", "Storm" and "Chaos"), and 1 requiring a Fusion Material Summoned with "NEX" ("Marine"), for a total of 10.

"Neo-Spacian" monsters are also bolstered by many support cards that range from swarming the field with "Cocoon Party" and "Contact", to upgrading them with "NEX".

A good card to include is "Elemental HERO Prisma". It can send a "Neos" monster to your Graveyard and have its own name treated as "Elemental HERO Neos". You can then use it for the Summon of a "Neo-Spacian Fusion", or use cards like "Wrath of Neos" on it. You can also use cards like "Birthright" and "O - Oversoul" to Special Summon "Elemental HERO Neos" from your Graveyard. Note that "Neo-Spacians" have low ATK, so a Contact Fusion must be quick.

"Miracle Contact" is the Neo-Spacians' best card, as it can access your hand, your side of the field, or your Graveyard for the monsters you need to Special Summon your "Neos" Fusion Monsters (however, any monster Summoned by "Miracle Contact" do not count as having been properly summoned, so they cannot be Special Summoned again through other cards or effects). "Contact Out" is especially useful in avoiding card effects that force your monsters to leave the field (such as those of your own "Neos" monsters), or can allow for multiple attacks if your opponent controls 1 or no monsters.

"Elemental HERO Neos Alius" is a Gemini monster whose effect allows him to be treated as if his name was "Elemental HERO Neos." This is very useful in a "Neo-Spacian" Deck, as it gives you the option of having more than three "Neos" to use in Contact Fusion. It is also a Level 4 monster with 1900 ATK. Given that "Neos Alius" is a Gemini monster, he can be supported by cards like "Supervise" and "Gemini Spark". One popular strategy is to stick exclusively to the most useful "Neo-Spacians": "Dark Panther", "Grand Mole", "Air Hummingbird" and "Flare Scarab".

Neo-Spacian Draw Engine
While the original purpose of the "Neo-Spacians" is to Contact Fusion with "Neos", with cards like "Convert Contact", "Cross Porter" and "Space Gift", they've become an interesting Draw Engine, Deck Thinner and Graveyard Filler disregarding "Neos".

The "Chrysalis" archetype could help in this, but they are very likely to be dead draws, so it's usually better just to avoid them.

"Convert Contact" is the key card, thinning your Deck by 3 cards and sending two monsters to the Graveyard (one of your choice) without making you lose hand advantage. The other key card, "Cross Porter" can be used to keep hand advantage, as it can be easily sent to the Graveyard with cards like "Armageddon Knight", "Foolish Burial", "Dark World Dealings" or "Neo-Spacian Aqua Dolphin". If revived (even with cards like Junk Synchron), it can provide an extra Neo-Spacian.

Once in the Graveyard, these monsters can then be used for different purposes, like the Special Summon of "Dark Simorgh"/"Chaos Sorcerer" or using cards like "The Beginning of the End". Since both "Cross Porter" and "Armageddon Knight" are low-level DARK Warrior monsters, and there is one DARK Neo Spacian and one Warrior Neo Spacian, cards that support DARK monsters (like "Dark Eruption"/"Allure of Darkness") and Warrior monsters (like "Reinforcement of the Army") work quite well.

The first known competitive Deck to use this Engine was Junk and Debris Deck.

Exodia OTK

 * See: Neo-Spacian Exodia OTK

Weaknesses
The main weakness of the "Neo-Spacians" is that their Fusion Monsters return to the Extra Deck during the End Phase of the turn. Relying on Field and Equip Spell Cards to keep monsters on the field can be easily thwarted with cards such as "Dust Tornado" and "Mystical Space Typhoon".

Also, "Neo-Spacians" are fairly weak on their own, with no specific support cards. Since "Elemental HERO Neos" is a Level 7 Normal Monster, specific cards to Summon it are needed.