In a "Elemental HERO Neos"-themed Deck, "Hero Signal" can really be used with "Neos Alius". It will set up for a faster "Gemini Summon" for next turn.
This card works really well in a Gemini Warrior Deck. With this card in this Deck, "Freed the Matchless General", "Symbols of Duty", or even "Silent Doom" can be used to search and/or Special Summon it and activate its effect.
Equip this card with "Supervise" to have it treated as "Elemental HERO Neos" and use it with a "Neo-Spacian" monster to Summon a "Neos" Fusion Monster. The effect of "Supervise" will activate, allowing yourself to Summon a Normal Monster in your Graveyard, such as "Elemental HERO Neos" or another "Elemental HERO Neos Alius".