Yukes are tall, slender creatures with vast knowledge who wear suits of armor that conceal their faces. It is theorized that in reality the armor serves as "bodies" and the Yukes are only souls that use a physical form to augment their magical abilities. In Final Fantasy Crystal Chronicles: Ring of Fates, when Yuri tells an NPC that he has seen Alhanalem's face, but when asked what he looks like, Yuri and Chelinka fall silent and seem somewhat troubled, implying it is not something they wish to try to describe. It is implied by Alhanalem and Meeth that removing a Yuke's mask and/or armor would result in a severe punishment if the Yuke does not have a strong relationship with the person removing the armor.
In Final Fantasy Crystal Chronicles: The Crystal Bearers, it is revealed that it does not matter if the armor of a Yuke is disassembled—as long as it is not damaged, the Yuke can reattach itself. If the armor is too damaged to sustain the Yuke, it may transfer itself to another armor. As The Crystal Bearers is in the far future, it may be that the Yukes have evolved from their feathered physical forms to merely souls, or that they became souls to adapt to life in the other dimension.
Like the Llilties, Yukes have a long lifespan. While the way a Yuke dresses can help to determine its gender, it can also be determined by the tiny wings on their backs. Male Yukes' wings are in the style of bat wings, while female Yukes' wings are in the style of bird wings.
Yukes in Final Fantasy Crystal Chronicles: The Crystal Bearers, as seen in the Yuke Sky City, have feathery wings, regardless of gender. It is unknown whether this is a mistake, or merely an indication that the wing identification method isn't always reliable. The only discerning feature between genders is the shape of their helmets; males have certain unique styles while females have their own, distinct from males, and even this isn't known to be 100% accurate, as the feminine-voiced Amidatelion switches from masculine-looking armour to feminine-looking armour, leaving his or her true gender ambiguous.
The Yukes are a mysterious tribe of great lore and wisdom. Many of these sages live quietly in Shella. In the ancient wars, they were able to resist the invading Liltian armies thanks to their magical prowess. Now, they spend their days teaching magic to others. Some say that Yukes assumed their current form to augment their magical talents.
- —Final Fantasy Crystal Chronicles instruction manual.
Yukes are the best magic casters. Although they suffer from being the slowest attacker and having the least strength, they are allowed to cast spells quicker than the other three races and start out with the highest Magic stat. When a Yuke uses the Defend command, they turn invisible, and are immune to damage and status afflictions. The Yukes use mallets and hammers as weapons.
The Yukes are rare, as the only place they appear in great numbers is Shella, their capital city where the Yukes spend most of their time teaching others how to use magic. The Yukes were the only race not defeated by the Lilties, but the Lilties' attempt to conquer the Yukes put the two races on bad terms; however, an NPC in Alfitaria notes that the two races are now seeing eye to eye.
Yukes in Crystal Chronicles include the Shella Caravan.
One of the playable characters in Story Mode, Alhanalem, is a Yuke.
Yukes' main weapons are staves. They have high Magic stats, gain greater elemental resistance as they level up, and their normal attacks are based on their Magic stats. Their Tribe Ability is called the "Magic Thread", allowing them to spread the effect of the magicite over a larger area using the touch screen to create a line from the magicite in the floor dragging its magic with the line. When a "Magic Needle" is nearby, players use the touch screen to draw a line from the needle to whatever element the needle is. This is usually used to solve puzzles.
Yukes appear in the Kingdom after an Inn is built. They do not stay and cannot be recruited until a Yuke Shack, an additional downloadable content, is built. Female Yukes can only be recruited as White Mages, and male Yukes can only be recruited as Black Mages. Although these are the only jobs, the Yukes that stay in the Inn will most commonly be Sages.
Yukes return as one of the four tribes to play as. A magic-based tribe, Yukes are experts on the art of spell casting, able to cast Ultima and Meteorga independently. Although able to equip almost every weapon, they specialize in the use of books, bells, and brooms, and like in Ring of Fates, they can equip staves and can create orb-like projectiles while doing so.
The game offers six default names for Yuke characters:
| Male Names:
|| Female Names:
Yukes have vanished from the world for thousands of years after a war with the Lilties, ending up in a Void-like dimension bordering existence.
Only the Yuke named Amidatelion, a Crystal Bearer, reappears in the world along with a horde of monsters. Amidatelion is trying to bring their lost tribe back into the world by collecting enough crystal shards to restore the Yuke crystal and bring their tribe back to restore the balance.
- In Final Fantasy Crystal Chronicles: Ring of Fates, Alhanalem mentions that no two Yukes ever have the same name.
- Yukes are the only race that cannot be customized by Artemicion in Final Fantasy Crystal Chronicles: Echoes of Time.
- In Final Fantasy Crystal Chronicles: The Crystal Bearers, if one removes a Yuke's head and throws it off the edge of the Yuke City, that Yuke will attempt to kill Layle with a -"ga" spell.