As you can probably tell from the story's title, the list will have girls from different series. Since the MC will be going into different worlds, I'm not sure how big his harem will be, so yeah. This list isn't permanent, but they are girls I liked when watching, or heard of, their respective series.
Harem List (With pictures):
Series: Tenchi Muyo War on Geminar
Mexiah Flan/Doll:
[If you've seen the show, you'll know they are two people in one body. In this case, the MC will have a part of his harem. How is he going to separate them? Not too sure yet, I'll cross that bridge when I get there.]
__________
Series: Gurren Lagann
Yoko Littner:
[I'll adjust her age to 17, the same age as the MC, to make this ship work.]