There's not much diversity you really can have there.
So...you do something else. It's not that difficult. Well, maybe for TN it is.
DOA constantly takes pride in homogenizing its characters. It doesn't matter what their personality is or who they are, they're all always down with dressing up as sexy bunnies or matching/interchangeable bikinis or sexy *insert whatever the fuck fetish they'll push out next* and getting ready for their next model photoshoot. What DOA constantly does is directly incompatible with making interesting and memorable characters. Oh, but they're
different bikinis from DOA5. They're still bikinis. And they already have two of them in DOA6 otherwise.
But sure, if the only criteria for "good" is that all the women are showing skin and the only criteria for "bad" is not showing skin, the santa bikinis are "good" and everyone should be happy. There's nothing to complain about...
We need some different criteria.