Okay, I've read the other worlds you people suggested. And I picked which ones a suitable for this story. So, here's what I added. 

Gears of War: 

Fairy Tail: 

Legend of Korra: 

Ghost of Tsushima: 

Red vs Blue: 

That's all the added worlds. If you have any harem member ideas either from new and old worlds or an OC, let me know at the comments below. Peace Out!