Personally I would like most to be treated the same as the Japanese version in terms of Sacred crystal giveaways, as i understand it we currently get but a small fraction of the SCs the Japanese version gets.
I would like to see the loli units brought in even if that means their H scenes need to be cut, it's hard not having the team flexibility.
Some more story missions would be cool.
I do think we need the Dark knight class sooner than later as the play an important role in team composition.
As for character aesthetic I have always had a soft spot for nekomimi girls so more of those would be great.