A Hero Emerges

 Zombyra the Dark appears in this card's artwork. This is fitting, as said monster is based on Zombire.

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This card's artwork is taken from , appropriately the first panel seen from the Zombire comic book where he emerges to save the day.

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The lore of this card's effect in both its release within Dark Revelation Volume 2 and the International release of Invasion of Chaos incorrectly states that 'you', rather than 'your opponent', chooses the card randomly.

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Each time this card was activated in the anime, this card's effect succeeded in Special Summoning a monster.

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Although this card has the word Hero in its name, it has no affiliation with the HERO archetype.

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Ironically though, Jaden Yuki, who runs an Elemental HERO Deck, has used this card in the anime during some of his Duels, namely to Special Summon Elemental HEROes" in a pinch.

In the "TCG", your opponent still chooses a card in your hand even if you cannot Special Summon (such as due to "Vanity's Emptiness").
In the "OCG", your opponent does not choose a card in this case.

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OCG Rulings

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The effect does not target.: A Hero Emerges

If you have no cards in your hand, or if you have no Monster Cards in your hand, "A Hero Emerges" cannot be activated.

If the opponent's randomly chosen monster is "Tsukuyomi", a Special Summon Monster, etc., if it was a monster that cannot be Special Summoned by the effect of "A Hero Emerges", that monster is sent to the Graveyard without being Special Summoned.

If you only have LIGHT monsters in your Monster Zones while the effect of "Gozen Match" is applying, providing you have a LIGHT monster in your hand that can be Special Summoned by the effect of "A Hero Emerges", you can activate "A Hero Emerges". (For example, in this case, if you only have DARK monsters in your hand, you cannot activate "A Hero Emerges".) Furthermore, while "Each player can only control 1 Attribute of monster. Send all other face-up monsters they control to the Graveyard" is applying, if the opponent chose a LIGHT monster it is Special Summoned normally, but if the opponent chose a non-LIGHT monster or a Spell/Trap Card, the chosen card is sent to the Graveyard.: While the effect of "Gozen Match" is applying, can you activate "A Hero Emerges"?

If "Vanity's Emptiness" is activated in Chain to the activation of "A Hero Emerges: If "Vanity's Emptiness" is activated in Chain to the activation of "A Hero Emerges", how does it resolve?

Previously Official Rulings

You can Special Summon a high-level monster, like "Dark Magician", with "A Hero Emerges". But if your opponent selects a Special Summon-only monster like "Dark Necrofear", or a Spirit Monster, it is sent to the Graveyard.

When "Guardian Elma" is selected for "A Hero Emerges", and you have "Butterfly Dagger - Elma" on your side of the field, you can Special Summon her, but if you don't have it, then she is sent to the Graveyard.

You can activate "A Hero Emerges" even if you have only 1 card in your hand.