Neptunia would of been included in the GUST pack if it was still with the company but after Neptunia mk2, they split. Though if TN really wanted to, they could just ask Compile Heart for the rights. I'm sure they wouldn't object.
Free Step Dodge
samuraihachi
Ichiron47
And when it happens, I'm hoping Mila get this costume:
https://i.kinja-img.com/gawker-media/image/upload/jwputwz0dh8qcjpujrlb.jpg
https://i.kinja-img.com/gawker-media/image/upload/jwputwz0dh8qcjpujrlb.jpg
samuraihachi
Uzume would be a perfect fit for Mila. If Neptunia does do a crossover with DOA, Hitomi's definitely gonna get Nepgear lol.
Ichiron47
That would be cool. But I kinda feel like Marie Rose would be Nepgear, because of her height, looks, and they both share the same voice actress!!!