This card has the number "39" on his left shoulder.
The artwork book of Kazuki Takahashi released on December 2011 revealed that this card originally had the number "3" instead of "39", as the artwork shows "03" on Utopia's shoulder.
The 3 in this card's number probably refers to the fact that it was one of the first three Xyz monsters released into the real game. The number 9 in this card's number is equal to 3 to the power of two. This may possibly reference the fact that this card was the second Number monster shown in the anime, or that it requires 2 XYZ materials to summon.
Lately, another copy of Utopia has been found in the "Utopia Value Box", which features a copy of Utopia's structure deck, four booster packs from the Yu-Gi-Oh! 5D's era and a large, blown up version of Utopia's card.
Referencing to this card's Japanese name, this monster seems related to the story of Pandora's box. The god, Zeus, told Pandora to not open the forbidden box, but she got curious. In the result, she opened it releasing all the evil into the world. Quickly, she closed the box leaving only "Hope" behind inside.
Number 39 appears to have taken its form and name from Yuma's kattobingu, as he never gives up until the very end.
Utopia is also derived from the Greek word for "good place" and "no place".
This card's TCG name and meaning (the former one, "good place") could also allude to the Heartland, the main setting of Yu-Gi-Oh! ZEXAL. By that, the Heartland (in appearance) seems to be a paradisaical locale.
The initial form of this monster is an ovular sword-like object of silver and gold. Most of this is its wings, which fold back to reveal the monster while its spikes pop out.
This card's monster form is similar in design to the Lancelot Albion from "Code Geass" with a similar color scheme, transformable wings, and twin set of swords.
When this card uses an Overlay unit it is absorbed through the orb on its chest.
When "Utopia" uses his effect his wings fold together to form a shield.
"Numbers" take the form of their original owner desires. In this case, it is to remain strong, never give up, and protect. The result is a Warrior-type monster who can negate attacks by detaching an "Xyz Material" from it, preventing monsters from being destroyed, and protecting a player from direct attacks.
This card's effect may represent Yuma himself, as by detaching one Overlay Unit, it negates an attack, protecting the monster or person being attacked, like how Yuma would go out of his way to protect his friends or anyone else; as well as his refusal to give up even when a situation is at its grimmest for him.
"Utopia" appears to be the most loyal Number to Astral: In episode 37 when Black Mist attacked Astral, "Utopia" protected him. Also Utopia acted completely on his own as both Astral and Black Mist were clearly surprised, implying that "Utopia", like "Number 83: Galaxy Queen" and "Black Mist", has a mind of his own.
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