These are just some random Neos stuff I came up with. Once I come up with more custom cards, I'll post them here.
Neo-Spacian Hell Scarab
****
Fire
Insect/Fusion/Effect
This card's name is treated as "Neo-Spacian Flare Scarab". This card cannot be Special Summoned except with "NEX". Increase the ATK of this monster by 500 for each Spell and Trap Card of the field.
ATK: 800
DEF: 800
Elemental Hero Hell Neos
********
Fire
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Hell Scarab
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use "Polymerization".) This card returns to the Fusion Deck during the End Phase. This card gains 500 ATK for each card in your hand.
ATK: 2800
DEF: 2300
Elemental Hero Aqua Flare Neos
*********
Water
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Flare Scarab + Neo-spacian Aqua Dolphin
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use "Polymerization".) This card returns to the Fusion Deck during the End Phase. This card gains 400 ATK for each card in your hand.
ATK: 3000
DEF: 2500
Elemental Hero Gravity Neos
*********
Earth
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Grand Mole + Neo-spacian Air Hummingbird
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use “Polymerization”.) While your life points are lower than your opponent’s, this card gains ATK equal to the difference. This card returns to the Fusion Deck during the End Phase.
ATK: 3000
DEF: 2500
Ok, I came up with a few more. So, here they are:
Neo-spacian Thunder Beetle
***
Light
Thunder/Effect
Select 1 "Neo-spacian" monster on your side of the field. While this monster is face-up on your side of the field, the selected monster gains DEF equal to the number of Spell Cards you control x400.
ATK: 400
DEF: 400
Elemental Hero Thunder Neos
*******
Light
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Thunder Beetle
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use "Polymerization".) This card returns to the Fusion Deck during the End Phase. Increase the DEF of this monster by 400 for each Spell Card in play.
ATK: 2500
DEF: 2000
Elemental Hero Thunder Flare Neos
*********
Fire
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Flare Scarab + Neo-spacian Thunder Beetle
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use "Polymerization".) This card returns to the Fusion Deck during the End Phase. During your Main Phase, you can choose and activate either of the following:
-increase the ATK of this monster by 400 for each card in play.
-increase the DEF of this monster by 400 for each card in play.
ATK: 3000
DEF: 2500
Here we go, again.
Neo-spacian Cyber Dog
***
Earth
Machine/Effect
When this monster is Normal Summoned or Flip Summoned, all Trap Cards on the field are destroyed.
ATK: 300
DEF: 600
Neo-spacian Death Rhino
***
Dark
Beast/Effect
Whe n this monster is Normal Summoned, inflict 400 damage to your opponent's life points for each dark monster in their Graveyard.
ATK: 1000
DEF: 200
Elemental Hero Cyber Neos
*******
Earth
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Cyber Dog
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use "Polymerization".) During the turn it which this monster was Fusion Summoned, all Trap Cards are destroyed, and neither player may activate any face-down Trap Cards. This card returns to the Fusion Deck during the End Phase.
ATK: 2500
DEF: 2000
Elemental Hero Death Neos
*******
Dark
Warrior/Fusion/Effect
Elemental Hero Neos + Neo-spacian Death Rhino
This card can only be Special Summoned from your Fusion Deck by returning the above cards you control to the Deck. (You do not use "Polymerization".) When this monster is Fusion Summoned, increase the ATK of this monster by 400 for each Dark monster on the field (excluding this card). This card returns to the Fusion Deck during the End Phase.
ATK: 2500
DEF: 2000