Eccentric Boy

 This card may be a reference to the song Eccentric Shounen Boy.

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This monster's wings resemble the wings on the Mark of the Dragon and the lines found on the Dark Signers' robes and faces.

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Though this card is included in the second Duelist Pack for Yusei, this card is not technically Yusei's card. Though it belonged to Sly, Yusei did borrow and use Eccentric Boy in his duel against Rudolf Heitmann.

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Eccentric is synonymous for words like weird and odd and this card has a very odd appearance and has an equally odd effect for a Tuner monster.

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This monster, T.G. Cyber Magician, Malefic Parallel Gear and Mara of the Nordic Alfar are the only Tuner monsters in all Yu-Gi-Oh that allow their non-Tuner Synchro Material monsters to tune with them from hand for a Synchro Summon.

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TCG Rulings

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Ronintoadin: "This card cannot be used as a Synchro Material Monster" is a condition, not an effect. It also applies in your hand, so you can't use "Ronintoadin" as a Synchro Material Monster with "Eccentric Boy" either.

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OCG Rulings

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The text "If this card is used as a Synchro Material Monster, the other Synchro Material Monsters must be 1 monster in your hand." of "Eccentric Boy" is not treated as the effect of an Effect Monster.: Effect Monster > Eccentric Boy

If you use "Eccentric Boy" and a monster in your hand as Synchro Material Monsters and the monster in your hand's Level has been changed by an effect like "Cost Down", then you use the monster's current, altered Level when performing the Synchro Summon.: If "Eccentric Boy" is used as a Synchro Material and the Levels of monsters in your hand has changed, then you use the Level at what time?

When resolving the effect of "De-Synchro", if the Synchro Monster is not returned to the Extra Deck, then you cannot Special Summon the Synchro Material Monsters from the Graveyard. Thus, if "De-Synchro" targets a Synchro Monster which was Special Summoned by using "Eccentric Boy", then the Synchro Monster is removed from play and not returned to the Extra Deck, so you cannot Special Summon the Synchro Material Monsters from the Graveyard.: If "De-Synchro" is activated on a Synchro Monster that used "Eccentric Boy", then can the Synchro Material Monsters be Special Summoned?

If "Beast of the Pharaoh" was sent from the hand to the Graveyard because it was used as a Synchro Material Monster for a Synchro Summon along with "Eccentric Boy", then the effect of "Beast of the Pharaoh" may be activated.: If "Eccentric Boy" and a "Beast of the Pharaoh" in the hand are used as Synchro Material Monsters, then can the effect of "Beast of the Pharaoh" be activated?

You cannot use "Eccentric Boy" and a monster from the hand as Synchro Material Monsters to Synchro Summon a monster like "Dark End Dragon" or "Arcanite Magician" if the Synchro Material Monsters are not the ones specified in the text of the Synchro Monster. To Synchro Summon "Dark End Dragon", you must send a DARK monster from your hand to the Graveyard as a Synchro Material Monster. To Synchro Summon "Arcanite Magician", you must send a Spellcaster-Type monster from your hand to the Graveyard as a Synchro Material Monster. To Synchro Summon "Mist Valley Thunder Lord", you must send a "Mist Valley" monster from your hand to the Graveyard as a Synchro Material Monster. To Synchro Summon "Black Brutdrago", you must send a Gemini monster from your hand to the Graveyard as a Synchro Material Monster. And so on.: If "Eccentric Boy" is used as a Synchro Material Monster to Synchro Summon "Dark End Dragon", then can you use a non-DARK Synchro Material Monster from your hand?

If you are Synchro Summoning because you activated "Urgent Tuning", then you may perform the Synchro Summon by using "Eccentric Boy" and a monster in your hand. In this case, if you do not have a monster in your hand which can be used as a Synchro Material Monster or you do not have a Synchro Monster in your Extra Deck which can be Special Summoned, then the opponent can check your hand and your Extra Deck to verify. Also in this case, you cannot activate "Urgent Tuning" if you do not have a monster in your hand which can be used for a Synchro Summon.: If you activate "Urgent Tuning", then can you Synchro Summon by sending to the Graveyard "Eccentric Boy" and monster in your hand as Synchro Material Monsters?

If you use a face-up "Eccentric Boy" and a "Tuningware" in your hand as Synchro Material Monsters, then you cannot apply the effect of "Tuningware" to treat it as a Level 2 monster. Thus, you can only Synchro Summon a Level 4 Synchro Monster, since you are using a face-up "Eccentric Boy" (Level 3) and a "Tuningware" in your hand (Level 1).: If you Synchro Summon by using "Eccentric Boy" and "Tuningware" as Synchro Material Monsters, then can you treat "Tuningware" as a Level 2 monster?

If you use a face-up "Eccentric Boy" and a "Tuningware" in your hand as Synchro Material Monsters, then you can activate the effect of "Tuningware" to draw one card when the Synchro Monster is successfully Synchro Summoned.

A Synchro Monster which used "Eccentric Boy" as a Synchro Material Monster cannot activate its effects and has its effects negated as long as the monster remains face-up on the field.: Is the effect of a Synchro Monster which used "Eccentric Boy" applied if "Imperial Iron Wall" is active?
Example: "Colossal Fighter" used "Eccentric Boy" as a Synchro Material Monster. If "Imperial Iron Wall" is active and that "Colossal Fighter" is destroyed by battle, then the effect of "Colossal Fighter" will activate, and the effect will not be negated.

If a Synchro Monster which used "Eccentric Boy" as a Synchro Material Monster is affected by "Interdimensional Matter Transporter", then the Synchro Monster is treated as being removed from play by the effect "it is removed from play when it is removed from the field" of "Eccentric Boy". During the End Phase, the Synchro Monster will not be returned to the field, and will remain removed from play.: If a monster is removed from play by "Interdimensional Matter Transporter" after it used "Eccentric Boy" as a Synchro Material Monster, then does it return to the field?

If "Eccentric Boy" is used as a Synchro Material Monster, then the other Synchro Material Monsters must be one monster from the hand. Thus, you cannot Synchro Summon a monster like "Mist Wurm" or "Ally of Justice Decisive Armor" which require two or more non-Tuner monsters.: Can "Mist Wurm" be Synchro Summoned by using "Eccentric Boy"?

The Special Summon of a Synchro Monster which used "Eccentric Boy" as a Synchro Material Monster is treated as a Synchro Summon. Thus, the Synchro Monster is treated as if it was Synchro Summoned properly, so the Synchro Monster may be Special Summoned by effects like "D.D.R. - Different Dimension Reincarnation".: Is the Special Summon of a Synchro Monster which used "Eccentric Boy" treated as a Synchro Summon?

If a Synchro Monster" which used "Eccentric Boy" as a Synchro Material Monster is flipped face-down by an effect like "Book of Moon", then from that point onward the effect of "Eccentric Boy" is no longer applied. Afterwards, the monster can activate its effects once it is flipped, and the effects which were negated are now applied. Also afterwards, the monster is not removed from play when it is removed from the field.: If a Synchro Monster is flipped face-down after it used "Eccentric Boy" as a Synchro Material Monster, then are its effects still negated?