Dragon Queen

The Dragon Queen, of the same name in Japanese, is deity in Dragon Quest III. She is a dragon who is the messenger of God and resides in the mountains.

Dragon Quest III
The Dragon Queen resides in her castle, Dragon Queen's Castle, which is surrounded by mountains and can only be reached by piloting Ramia. At the time she meets the Hero she is seriously ill and is barely clinging onto life. She will shortly die moments after meeting the Hero and entrusts them with the Sphere of Light.

As she dies, she leaves behind an egg. Going by Emblem of Roto, this egg would hatch into the Dragonlord which would make him her son. Regardless of the authenticity of this, the Dragon Quest is at least the ancestor of the Dragonlord.

Novel
Rubiss entrusted the Dragon Queen to watch over the realm in her absence. However, as the Dragon Queen became ill it became impossible for her to do so effectively. She could have defeated Baramos on her own if it was not for this fact.

Dragon Quest XI
It is likely that the Dragon Queen is a descendant of Yggdragon as the

Soula of the Blue Sky
She appears as part of volume 1, going over the meaning of the name 'Dragon Quest'.

Trivia

 * The role of the Dragon Queen is played by Yoko Takahashi (of Neon Genesis Evangelion fame) as part of the Dragon Quest Live Spectacle Tour in 2016