Rachel

"'You thought everything would be fine, but that Nephilim has to die'""-Rachel to Nathaniel about his daughter."

Rachel is an Angel. She led her own Garrison that was supposed to guard the Gates of Heaven.

Season 1
In season 1 of Angelic Grace, Rachel is only seen through flashbacks to Nathaniel's time in Heaven. She is seen as being kind and loving towards her brothers and sisters and is also seen as a bit of a hardass always bossing her Garrison around to let souls into heaven.

Season 2
In season 2 of Angelic Grace, Rachel is seen in a new vessel, she is now on earth so that she can kill Nathaniel's daughter. Nathaniel is confronted by Rachel and they battle, while Rachel gets a few good hits in, she is ultimately killed by Nathaniel using his Seraph Blade.

Powers and Abilities
Although very few of her powers have been shown, Rachel was a common/average angel and had the usual powers.
 * Angelic Possession - As an angel, Rachael requires a vessel while on Earth, but she, of course, needs the vessel's consent.
 * Immortality - Like all angels, Rachel does not age, is capable of living forever, and cannot be killed by diseases, toxins, viruses, illnesses, or Earthly conventional weapons.
 * Super Strength - It is unknown how strong Rachel was exactly, but she had the strength of a normal angel. Being an angel, she was possibly stronger than humans, ghosts, monsters, and most demons and she was even strong enough to fight and even stab the Seraph Nathaniel.
 * Teleportation - Rachel could efficiently teleport anywhere that is not sigil mark protected.
 * Wings - Rachel could display her wings as a way to intimidate someone.

Weaknesses
These are the weaknesses she displayed on the show.
 * Seraph Blade - she was killed by Nathaniel's Seraph Blade.