Gagaga Child

 This monster appears to be a younger version of Gagaga Magician, as hinted by the orange visor and the same hat.

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Based on its name - Gagaga Child - it is also possible for this monster to be the son of Gagaga Magician, similar to how Gagaga Sister is the supposed younger sister of Gagaga Girl.

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This card is the only male Gagaga monster that does not cover up his face.

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This monster has the Gagaga crest imprinted on the orange buttons on both sides of his visor.

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This monster's clothing resembles in part the Heartland Academy uniform.

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Coincidentally, this card belongs to Yuma Tsukumo, a student of that academy.

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This monster appears to be holding a popsicle, probably based on the popular Gari-Gari Kun popsicles in Japan. In the anime, he eats the popsicle when he uses his Level-changing effect.

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This card appears to have Synchro Summon rings in the background of its picture.

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This is interesting, as its older counterpart, Gagaga Magician cannot be used as a Synchro Material.

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In the English dub, Yuma inexplicably never refers to Gagaga Child by name, opting to call him this little fella every time he is Summoned.

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This monster appears in Guard Go!".

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OCG Rulings

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Special Summoning this card from the hand does not start a Chain Link.: Gagaga Child

The effect that activates when this card is Special Summoned by the method described in its text targets 1 "Gagaga" monster you control.

The effect that "this card's Level becomes the Level of that monster" cannot target itself or another monster of the same Level.

"Gagaga Child" can be Special Summoned by the method described in its text during the Main Phase 2. However, the effect that "this card's Level becomes the Level of that monster" cannot be activated during the Main Phase 2.: If "Gagaga Child" is Special Summoned during the Main Phase 2, can its effect that this card's Level becomes the Level of that monster be activated?