1) An even further-expanded tutorial mode.
2) An actual, memorable original soundtrack that lives up to the first 3 DOA games... preferably composed by Yuzo Koshiro.
3) An attract mode... something Dead or Alive Dimensions and the console versions of every iteration of DOA5 has been lacking. Yeah, I'm aware it's trivial to some people, but one would think that for as long as DOA5 Ultimate Arcade has been around in Japanese arcades, the least Team Ninja could've done was give us an attract mode for the console versions in the updates following its release. Even if the game is sitting idle at your local gaming area, it would at least have a casual fighting chance with other fighting games that have it if people saw what the game is capable of in a demo following the title screen. It certainly shows it off better than staring at a monotonous black screen with a title.
4) A versus screen. Again, like the attract mode, I'm aware it may be trivial to some people, but when done right it's the little things like this that gets you pumped for the match just seconds away IMO. They had one for DOA Dimensions (albeit in story mode only), so why not expand on that for actual versus gameplay?
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5) The return of DOA4's (universal?) ground game. As much flak as the game gets competitively, one positive aspect of the game was the consistency and comprehension of how force techs were executed. If the opponent didn't techroll or gets knocked down, every character could get at least two ground hits in-- after staggering a knocked-down opponent with 2k, you could follow with a different low attack which - depending on the low - would force tech them backwards or to the left or right side.
6) Bring this costume back for Christie.
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7) Please, no palette-swapped costumes as PAID DLC. Let the main focus of paid DLC be for the more unique, original costumes offered post-launch. Most of the swimsuit /fetish-themed costumes in DOA5's run are also commonly seen in the DOAX series anyway, so here's a suggestion... if DOA6 is going to use a different graphics engine (and it obviously will), why not make a future DOAX title on the same engine that allows you to transfer the more swimsuit / fetish-themed costumes to DOA6 directly from that installment with your own saved custom colors for it? It saves a lot of time and effort or the dev team focusing on DOA6 to focus more on other uniquely designed costumes.
8) Dojo / Tatami with (appropriate) customizable flooring using large PNG image files. It's likely gonna be banned at tourneys anyway, but at least you'll have a little personality to your training stage.
9) Stage and menu-specific custom soundtracks via music files not in-game. If TTT2 can do this via Tekken Tunes on a PS3, surely DOA6 can do something similar.
10) Give tag matches the necessary tweaks (such as gravity, certain moves resetting the ground bounce threshold, etc) to become as competitively viable as single matches.
11) A vastly improved cinematic story mode, with DLC chapter expansions to further expand on the backstory for every non-guest DLC character that is added post-launch.