She is a a female with a large chest,darker skin,brown eyes,long black hair,she wears a normal First Order uniform however in her uniform the chest area is unbuttoned,she has a close relationship with Captain Phasma...it's joked by Stormtroopers that perhaps they are more than friendly co-workers...

She is in Captain Phasma's inner circle,which is all female.

She lives during the Sequel trilogy.

Information in the picture.

Smaragd/Emerald(which is the direct translation of her name.)

'Magma' Hashira(later renamed to Magma-dancer.)

Stormtrooper.

Might have a crush on Captain Phasma.

Lesbian!Female

Weirdly none of the male stormtroopers seem to bother her...

She views Azriel Cipher as her sibling,as well as FN-2187.

A more updated image of her,explaining her rank(Admiral.)