Nirrti

Nirrti is a "child", or soul, that you can summon to fight your way through the world of Destiny Child.

Profile
Nirrti the exorcist was in a precarious and tortured state, teetering dangerously on the precipice of death. She managed to hold on to her life, but doing so cost her her memories. It was at this point she met the young master and formed a pact with him, creating a Child in her image. Her name is taken from an alias for Kali, the goddess of destruction. Once an exorcist, she is now completely loyal to her demon master. Her one wish is to lay waste to all those who would oppose her.

Children
It should be noted that in this case, the use of "child" does not mean the character is a child. Like all the other summons in this game, "child" simply refers to the soul that is being summoned.