Now that customization is a thing in DOA6 now here's kinda what I want in the mode so DOA6 can have alot of customization potential xD :
-They need more glasses and eyewear options tbh. While I am happy at the current selection, they should add more styles so that there's more variety, like different colors, frames, etc. They can also add eyepatches and other eyewear as well and maybe use some older ones from 5U/LR they got from Halloween DLC packs.
Also they could do easter egg type head gear as well, like Hayate can wear his Ein shades, and Ayane can wear Genra's mask, and Rig should be able to wear his glowing red eyes as an option as well too.
-Add more hairstyles. If they're bringing back Ultimate and LR styles that's great, but they should add more for everyone so that it's not just the girls getting stuff. Eliot also should get at least one more style too. They should also bring any xtreme 3/Venus Vacation hairstyles in the game too, like Kasumi's new low ponytail and Nyo's pinned up hair and such. It also wouldn't hurt for them to add Halloween exclusive hairstyles in DOA6 as well too and maybe even hairstyles from general fan design contests.
-Add more accessories, like in Venus Vacation the girls can wear earrings and flowers and such. Why not bring that over in DOA6?
-They should give us the option to use ripped outfit variants so that if you want to play with Diego with no undershirt or if you want to play Ayane with no hood, you can choose that like how SC6 does.
-Make tans a universal option and not just costume specific, although if they don't do that I don't mind since Kasumi has it in her white shinobi dress.
-Add a character viewer in this mode so we can view the whole character rather than just the upper body and add the option to rotate them too so you can see how hairstyles like Marie Rose's ponytail actually look since the ponytails are so thin that you can't really see them.
-Finally they need to take advantage of this new mode and add more items as DLC so that the mode won't just be there, I feel like they could have done this in LR but because of how they handled the customization UI in character select they couldn't, now that the mode is now a standalone mode, they should invest in it xD