Alexander_the_grey
Ahhh jack the ripper, an absenteeism absolute favorite of all dxd x fate crossover. Almost always see her, and I approve. As for Gabriel, I would suggest naming him something in the vain of Shepard (Commander Shepard). You already got mass effect in the story, now bring in Shepard and bring humanity into the stars to maybe even find the ultimate evil(Reapers) since the power scale is way tipped to Liths side.
Reader friends and author, I vote for Nightgale to enter the harem in the future and with her to advance medicine in Azeroth in the future. and about the world war you can do as in Percy Jackson the children of Poiseon, Hades and Zeus started the war and with that the camp of the demigods, leading to Hera or Aphrodite being able to reach the Mc "wink" "wink"
Thank you for the chapter Gabriel and Lith child suggection -since it might be in the realm of holy-demonic(godhood) energy then maybe something along the lines of Lucifer (TV series) daughter's wings which are edged with blades and the red colour. It gives that sence that she's angelic but not fallen but in between. -when it comes to looks its up to you. I only had the loos suggestion -powers then i would say her powers will have to go with maybe movement of celestial bodies (i have no idea if gravity is a thing in space) but whatever allows movement(stillness,speed) she can remove the kinetic energy from beings or moving objects as well as give it. Lets just call it celestial motion,the rotation of the earth around the sun,galaxies around a black hole,so its like gravity but constant,if you want to see it in an OP way then even expansion of the universe to birth of planets require that motion(i havent researched this but i believe earth rotates on an exis because of the rotation of the earths core and the earth was formed due to the constant rotation whereby the care was slowly surrounded by debree to form the layers we know) something along thos lines