|Prototype Model Unit XJ-1|
|Age||1 (mentally, and physically actually older than because she was created before her)|
|Eye color||Two bulbs-shaped eyes.|
|Hair color|| Appearance 1: An egg-shaped robot that is made with glass.|
Two bulbs-shaped eyes.
She is a light blue robot.
A tooth in the mouth.
In the head has two antennae with small white circle.
A white diaper with a blue brooch.
|Nicknames||Appearance 2: She is smallest and youngest of the XJ-Sisters and basically a baby robot. She can neither talk nor fight and she is easily frightened by most villains she comes face to face. She expresses this fear by crying and developing an oil leak.|
|Likes||The XJ-Sisters, fighting against villains|
|Love interests||Personality: She is startled easily, but she is clean, cute, beautiful, crybaby, happy and really sweet.|
|Enemies|| Dr. Locus|
|First appearance||Sibling Tsunami|
|Voiced by:||Janice Kawaye|