Umbra Astra is the eldest of the Celestial Being trio. They are the physical embodiment, or personification, of the Void. Older sibling of Solaria and Lunaria. (They use they/them pronouns.)

Solaria Astra is the second eldest of the Celestial Being trio. She is the physical embodiment, or the personification, of the Sun. Older sister of Lunaria.

Lunaria Astra is the youngest of the Celestial Being trio. She is the physical embodiment, or the personification, of Earth's Moon. (This is my first talkie, btw.) (You can be and do whatever you want.)