|Voice Actor||Hitomi Yoshida|
|Fur Color||Light brown (head)|
Dark brown (ears, coat and tail tip)
White (body and tail)
|Magical Ranking||Acrylic (JP1)|
Dog-walking volunteer (LJP)
|Partner||Prime Minister (JP1)|
|Magical Item||Jewel Pod (JPKD/JPH)|
Jewel Pad (LJP)
Yuku is a naturally colored beagle dog with a light brown head, dark brown ears, coat and tail tip and white body and tail. His Jewel Eyes are made out of blue euclases. For his attire, he wears a blue beret on top of his head and a light blue bowtie around his neck.
Yuku's Jewel Charm is hexagon-shaped. It is decorated with blue euclases and a blue musical note in the center, along with Yuku's bowtie in the bottom. It also features a yellow base with white waves and trim for decoration.
According to the official website, Yuku really loves to sing, and isn't afraid to show off his singing voice.
In the first series, Yuku believes magic shouldn't be relied on for everything, based on his own lack of talent at it.
As the Jewelpet of Intelligence, Yuku's magic spells can increase humans' intellect and make them much more smarter and clever. His power in the official setting can also allow humans to settle arguments in a calm way. In Jewelpet, his magic can give humans insight too.
In episode 26b, Yuku is a painter who meets Ruby at a group date and asks her to pretend to marry him to please his grandparents. Ruby gets angry at him for lying to them and he ends up genuinely falling in love with her. In a later episode, he is seen in the human world trying to sell his artworks.
- Main article: Yuku/Image Gallery
- Yuku's jewel motif is the euclase, a beryllium aluminium hydroxide silicate which is a product of the decomposition of beryl in pegmatites.
- Yuku shares the same Japanese voice actor with Lester from Yu-Gi-Oh! 5D's.
|Magical Red||Ruby • Garnet • Rin • Ryl • Kohaku • Titana • Sango • Nix • Alex • Brownie • Jasper • Rosa|
|Magical Blue||Sapphie • Luna • Yuku • Aqua • Kaiya • Opal • Amelie • Lapis • Io • Topaz • Charotte • Larimar|
|Magical Green||Peridot • Chite • Prase • Rald • Flora • Tour • Milky • Nephrite • Tata • Kris • Angela|
|Magical Black||Diana • King • Dian • Labra • Granite • Coal • Luea|
|Unknown Class||Nachi (non-canon)|