|Voice Actor||Hitomi Yoshida|
|Fur Color||Light brown, brown and white|
|Magical Ranking||Acrylic (JP1)|
Dog-walking volunteer (LJP)
|Partner||Prime Minister (JP1)|
Yuku is a naturally colored beagle, he is light brown, brown and white in color along with blue euclase Jewel Eyes. He wears a blue beret on the top of his head and a light blue bowtie on 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.
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 Intellect, Yuku is one of the more intelligent Jewelpets and has better deductive capacities than any other.
In Jewelpet Sunshine, he 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. He is later seen in the human world trying to sell his art.
- Yuku's jewel motif is the euclase, a beryllium aluminium hydroxide silicate which is a product of the decomposition of beryl in pegmatites.
|Magical Red||Ruby • Garnet • Rin • Ryl • Kohaku • Titana • Sango • Nix • Alex • Brownie • Jasper • Lolip • 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|