Depends on the type of Elemental hero's neos.
Example: Elemental hero aqua neos or Elemental hero divine neos,..etc.
No, the 'Neos' fusion monsters state how they must be summoned on their cards. The monsters must be returned from field to deck, you can't summon them like regular Fusion monsters using a fusion card and components in hand.
No, nowhere on the card does it even imply that happens.
No. The Neos Fusion Monsters that use Neo Spacians can ONLY be Special Summoned by "Contact Fusion", meaning the fusion material monsters must be on the field and are sent to the Graveyard to Special Summon the monster.
There is no card called "Miracle Contact" so:If you are referring to using "Miracle Fusion" with "E-Hero Neos Alius" (when not Double Summoned), then you can use it if the Fusion Material monsters does not call for a specificE-Hero. If the Fusion Material monster required is "E-Hero Neos" then you first need to Double Summon "E-Hero Neos Alius".If you are instead talking about using "Contact Out" on a Neos Fusion Monster and Special Summoning "E-Hero Neos Alius" from your deck, you can not since while it is in the deck it's name is not "E-Hero Neos".
No, polymerization is a fusion spell card used to fuse multiple monsters to summon a new fusion monster. It is not necessary to use polymerization to summon Elemental HERO monsters, as there are other fusion substitute cards and support cards that can be used instead.
You use any appropriate Fusion Summon card (ie Polymerization) while you have Elemental HERO Neos and any 'Ultimate Crystal' monster such as Rainbow Dragon, either in hand or on the field.
Blue-Eyes Ultimate DragonXYZ-Dragon Cannon (Contact Fusion)Ojama KingElemental Hero Storm Neos (Contact Fusion)Elemental Hero Magma Neos (Contact Fusion)Elemental Hero Chaos Neos (Contact Fusion)Chimeratech Overdragon (Fusion Summoned with at least 2 monsters)Cyber End DragonArcana Knight JokerArmityle the Chaos Phantom (Contact Fusion)Gladiator Beast Heraklinos (Contact Fusion)Super Vehicroid Jumbo DrillUltimate Ancient Gear Golem
If the E-Hero trying to be Fusion Summoned requires a nonspecific E-Hero (such as "E-Hero Absolute Zero), then "Neos Alius" can be used. If the Fusion Monster requires "E-Hero Neos", "Neos Alius" cannot be used since its card name cannot be treated as "E-Hero Neos" while in the Graveyard. (Though this only applies to "Rainbow Neos" who actually is not a E-Hero fusion monster.)
No even if Jaiden yuki did use super polymerization in the anime to summon evil hero's the card text clearly says they can only be summoned using dark fusion. So the answer is no. Only dark fusion and dark calling can be used to summon them
Not all the time. Some fusion monsters have special summoning conditions. e.g: Elemental Hero Neos fusions can only be summoned by returning the fusion material monsters from the field to the deck. XYZ Dragon Cannon can only be summoned by removing the fusion material monsters on the field from play There are also other cards for monster fusion, here are a few examples and a URL for a full list and more info. http://yugioh.wikia.com/wiki/Fusion_Monsters -Fusion Gate -Super Polymerization -Future Fusion
Fusion Monsters that are summoned without using Polymerization (and similar) cannot be summoned via Future Fusion, meaning you can't select them for Future Fusion in the first place. Other monsters that this applies to are Gladiator Beast Heraklinos, Armityle the Chaos Phantom, and the Neos fusions such as Elemental HERO Dark Neos.
Rainbow Neos is a fusion of Elemental Hero Neos, and either Rainbow Dragon, or Rainbow Dark Dragon.