I can definitely agree on hairstyles; and yep, equipment compatibility too and hell; with new technology, we should have unlimited character slots; especially for PC version if Namco decides to make it and let's face it, since Namco is porting/making games for the PC now due to its profitability (I myself don't even have a PS4, Wii U or Xbone in my house); Soulcalibur and Tekken are pretty bound for that.
And again; I'm pretty sure with new technology, we will be able to get moar sticker slots and what not and this is what my ideal SC6 would be.
-Return of Chronicle of the Sword, aka the best single-player mode in a fighting game.
-No guest characters. Soulcalibur III was better for not having guest characters. Focus on making the game great, don't do character tie-in; especially if they violate the rules of the Soulcalibur universe.
-Allow for user-generated content, like hairstyles and what not. If Fallout 4 can have mods on consoles (although console mod library won't be as big as PC mod library), then Namco should be able to have this across all platforms, although expect out-of-place, lore-unfriendly hairstyles in your library. Also if someone uses UGC; have them either can't play online with those UGC or have the UGC pieces downloaded to the other player's platform (Xbox One or PC, for example).
-Have cosmetic DLCs again, release maps and characters for free. Cosmetic DLC aka CAS pieces. Rocket League has a similar business model.
-Release SC6 not just on consoles, but for PC. Maybe even release older Soulcaliburs (3-5) on PC and in HD first to give gamers a taste of the series.
-Don't try to make the game accessible for babies, too many games are doing this now.
-Take your time, make this game great so we can get a Soulcalibur that is "Overwhelmingly Positive" on Steam (the only people that have credibility when it comes to reviews are Steam user reviewers).
If they bring it to PC, and they should considering that some of us are sick of MS and Sony's antics I hope they...
-Don't tie the physics to framerate. Lemme go at 144fps if I want to.
-Bring in good options, like Ambient Occlusion (this option mah favorite), godrays, different kinds of antialiasing (MSAA, FXAA, SMAA, TXAA), softer shadows (playing SC5 on the 360 bugged me when it came to this), borderless windowed and other options that would make TotalBiscuit orgasm.
-Maybe bringing cross-play isn't a good idea, as us PC gamers would have to wait for the peasant to get in the game for two minutes while we jump in instantly with our SSDs and what not.
-Make this game AMD-optimized, because then both AMD and NVIDIA can have good times.
-Add in dat local multiplayer, mateys. I like having friends over for Soulcalibur and having friends over for Soulcalibur on PC with amazing graphics would be pretty sweet.