Basically for the casual side I want what DOA6 introduced but refined and not tied to that Zack dollars system:
-Additional hairstyles, universal hair and hats for all outfits like 6 had later on, and make the hair color change thing something that doesn't cost real money. I wouldn't mind three additional colors or so for outfits like DOA6 introduced
-Additional characters, some original and maybe some girls from Venus Vacation added in alongside Tamaki. Some more guests would be cool too, maybe add Naotora in again but with an additional SW character and maybe an additional male KOF to join Mai and Kula.
-Add the scrapped tag mode and add in the additional menu dialogues we would have had, and also that unused gallery mode, and all songs from older DOA games including remixes. And make the main menu backdrop stage selectable. Also it'd be nice to also have the story mode stages selectable by default.
-For the game system, they should definitely refine the meter system if they intend to keep it, and also buff characters who weren't strong in DOA6's final months and better balance characters who were particularly strong. Also they should add in the heavy force techs from DOA5LR since I think the way the ground system is now would greatly be enhanced with that added element rather than the light force techs we were left with.
-Major visual overhaul. DOA6 looked great but it was very obvious that they reused alot of stuff and just upped the texture quality, like with the hair and cloth. They need to remake the hair models and body models so that way they look fresh.
-Soft engine should stay in and also they can revamp the sweat and dirt and bruises since they were nicely done, but I think a new DOA could take that further.
-For the story, they need to go all out and either do a reboot or have something lengthy and meaningful. DOA6 story felt at times like a gacha and alot of stuff was unresolved or left ambiguous