Clockwise from left to right: "Flare Scarab", "Air Hummingbird", "Aqua Dolphin", "Grand Mole", "Glow Moss" and "Dark Panther".
|Neo-Spacian||Neos Fusion||Neo-Spacian||Neos Fusion|
|Air Hummingbird||Air Neos||None||None||Chicky|
|Aqua Dolphin||Aqua Neos||Marine Dolphin||Marine Neos||Dolphin|
|Dark Panther||Dark Neos||None||None||Pantail|
|Flare Scarab||Flare Neos||None||None||Larva|
|Glow Moss||Glow Neos||Twinkle Moss||None||Pinny|
|Grand Mole||Grand Neos||None||None||Mole|
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.
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".
"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.
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 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. Their Chrysalis forms have plenty of methods for Special Summoning Neo-Spacians, but if you dead draw, with no way to Summon Neos, your opponent can lay into you right off the bat.
Summoners (Normal Spell Cards)
|Moonface the Silver
|Leon the Lead
|Salamandra the Steel
|Ouroboros the Bronze
|Ekenas the Mercury
|Aretos the Tin
Tin Spell Circle
|Aroma||None Yet||Cananga||Bergamot||Jasmine / Angelica / Rosemary||Rosemary||Jar|
(500 ATK▲/400 DEF▼)
|Mystic Plasma Zone||Gaia Power||Molten Destruction||Luminous Spark||Umiiruka||Rising Air Current|
|Attribute Reptiles||Umbral Soul||Raging Earth||Firestorm Prominence||Radiant Spirit||Silent Abyss||Destruction Cyclone|
|Attribute Summoners||Mystic Tomato||Giant Rat||UFO Turtle||Shining Angel||Mother Grizzly||Flying Kamakiri #1|
|B.E.S.||Big Core||Covered Core||Big Core MK-2||Assault Core||Crystal Core||Tetran|
|Boosters (500 ATK▲/400 DEF▼)||Witch's Apprentice||Milus Radiant||Little Chimera||Hoshiningen||Star Boy||Bladefly|
Glow Moss / Twinkle Moss
Glow / None Yet
Aqua Dolphin / Marine Dolphin
Aqua / Marine
|Dice Roll Archfiends||Terrorking||Vilepawn||Infernalqueen||Desrook||Darkbishop||Shadowknight|
|The Trojan Horse
|Kaiser Sea Horse
|Dustons (1/0/1000 Fiends)||Star||Yellow||Red||House / White||Blue||Green|
|Elemental HERO Fusion Monsters
(1 "HERO" + 1 matching Attribute)
|Escuridao||Gaia||Nova Master||The Shining||Absolute Zero||Great Tornado|
|Entity monsters||Outer Entity Azzathoth||Outer Entity Nyarla||Old Entity Chthugha||Elder Entity N'tss||Elder Entity Norden||Old Entity Hastorr|
(400 ATK▲/200 DEF▼)
|Sword of Dark Destruction||Invigoration||Burning Spear||Elf's Light||Steel Shell||Gust Fan|
Shooting Star Bow
Twin Swords of Flashing Light
Rod of Silence
|Kaiju||Radian||Kumongous||Dogoran||Jizukiru / Mecha-Dogoran / Thunder King||Gameciel||Gadarla|
|Legendary Planets||Jupiter / Saturn / Sun||Terra Firma||Mars||Venus / Uranus||Mercury / Neptune||None Yet|
|Non-Fusion Masked HERO
Level 6 M-HERO Fusion Monster
Level 8 M-HERO Fusion Monster
|Monarchs||Caius / Delg / Erebus / Angmarl / Tenma||Granmarg||Thestalos||Zaborg / Kuraz / Ehther||Mobius||Raiza|
Related "Monarch" Spell/Trap Card
|Caius / None Yet / None Yet / None Yet / None Yet
Tenacity / None Yet / The First / None Yet / None Yet
|Zaborg / None Yet / None Yet
Strike / None Yet / The Prime
|Monarch "Vassal"||Lucius / None Yet / Eidos / None Yet / None Yet||Landrobe||Berlineth||Mithra / None Yet / Edea||Escher||Garum|
|Musical Djinns||Maestroke the Symphony||Temtempo the Percussion||None Yet||Melomelody the Brass||Humhumming the Key||Muzurhythm the String|
|Odd-Eyes Dragons||Odd-Eyes / Pendulum / Rebellion / Phantom / Persona||Gravity||Meteorburst||Saber||Absolute||Vortex|
|Pendulum Magicians||Stargazer / Timegazer / Xiangke / Timebreaker / Acrobat / Descend Dragon||Dragonpulse||Nobledragon||Xiangsheng / Wisdom-Eye / Dharma-Eye||Dragonpit||Oafdragon|
(below Level 4 Fiend-type tuners)
|Dark / Synkron||Clock||Flare / Red||Barrier / Chain / Mirror||Force||Creation|
|El Shaddoll Fusion Monsters
(1 "Shaddoll" + 1 matching Attribute)
Legendary Six Samurai
|Nitro / Jet
Nitro / Jet
|Yang Zing Effect Monsters
Yang Zing Synchro Monsters
|Jiaotu / Taotie
|Bi'an / Zefraxi / Zefraniu||Suanni||Chiwen
Baxia / Chaofeng