Much expanded and improved character creation... BDO and Aion were some of my favorite systems, though maybe less with the wild body shape variations Aion let's you have... some are a little disturbing looking tbh. But I mean, sliders, customizability down to the way the hair lays over your shoulders, detail editing, rgb color palette... Stuff like that. None of this "horns must be attached to face and you only get x types of customization options and every race has to have the same number and type no matter what" stuff.
Healing classes that actually need to heal. Where I don't need to dps. I want dps to be a bonus for when the group is doing very well, not the default expectation and the ONLY thing to do if the group is doing even vaguely in the realm of well
Improved PvP system. Would prefer 2 faction PvP tbh.
Better... Idk, is it the servers or something else that gives the crazy delay and no responsiveness on some abilities? Ideally I want my spell to go off when I tell it to, not with a year and a half delay (yes very hyperbolic but seriously rescue in particular has some godawful delay) and like... Something in PvP just feels off? Like the spells don't feel. Responsive somehow. I don't get that impactful feeling. It's just chipping away at people's health and watching healers keep them alive forever or watching people get deleted and not a ton in between in my experience. I'm not sure how to describe what it is but PvP combat just isn't very fun in this game compared to some others I've played. I had more fun pvping in wow than here by far.
Much expanded and improved housing system. Like, in a perfect world, wards with unlimited plots... Otherwise instanced housing, even if it's like... A ward where every house is an instance, kind of like what BDO has where everyone can buy the same lot but it looks different inside for each player. Have walled in yards for outdoor decorating. And far more movement and freedom for adjusting where things go - so you don't need to glitch half your furniture to stop it from looking weird.
More incentives to actually be in free companies. More perks of some kind, idk. Separate free company/guild housing from personal housing.
Way more slots for things like linkshells
An actual bank. Separate from posting auctions, and separate from retainer style missions.
Options for my character to actually have a personality. Even let reputation or the way NPCs respond to you be impacted by your choices. Not in a way that locks you out of content necessarily, but enough to add flavor and let you really create a character with some personality
Streamlined menu system. Fewer separate inventories... But more space in general. Instead of chunking it into separate boxes that can't even all be open at once. Something cleaner.
Multiple dye channels on gear
Customizable gear? Like you can edit parts of it. Not sure how feasible but it'd be cool. If love to lop off some of the weird capes and huge bags on some of the gear in this game. I have more than one chest piece I love except for some massive pack hanging awkwardly to the side and smacking my leg as I move
A way to track what minions and mounts you DON'T have (does this game have one I missed?)
Something like glamour plates but not shared between classes
Allowed trade between alts. House sharing with alts. Story skipping with alts for quests you've already done on your main.
Actually I'd love for story and progression to be less intertwined than here. I'd want to be able to unlock most of the content without doing the story and vise versa - a game where the story dungeons and regular dungeons are separate. Possibly have something like roulettes for both, to help queues, but not lock people to have to do both if they want to do one. I know FF is a very story driven series, but as someone who's never played any other FF game and frankly has close to no interest in doing so, that has been one of the most frustrating things about this game and the thought of replaying the msq in full on an alt is a dreadful one. But I like playing alts. I'd love this game more if alts were fun to play in it.