An [[umamusume|Umamusume]] character. A seemly young lady with a rather stoic appearance that can be mistaken for a doll. She does express emotions but few (such as her trainer) will see it.

Her competition outfit is basically a gothic lolita-theme outfit.

h5. Official Profile
“Be splendid. Be supreme. Always be the brightest. That is the crown jewel of our clan.”
―Daiichi Ruby

Daiichi Ruby is a daughter of the "Splendid Clan" whose name is known throughout the world. She always strives to behave in a noble manner befitting her name, though her stern speech and behavior make her somewhat unapproachable. She gives the impression that she is not a stranger to others.

h5. Associated Characters
* [[K.S.Miracle (umamusume)|]] - Roommate
* [[Daitaku Helios (umamusume)|]] -
ダイイチルビー(ウマ娘)