What feature[s] are you fairly certain would never make it into the game,but wish you could see anyway?
Completely separate UI and character controls.
UI = Keyboard + Mouse
Character = Gamepad only
And with it different control configurations for the various base classes.
I could get into details on how I would lay out controls - but since this system will never happen; why bother with a wall of text.
Proper coding. ( ͡° ͜ʖ ͡°)

I’d like to see the game run at least 50% faster, maybe up to 200% on some of the more pathetic bosses.
Also, have everything combat be client side so we don’t have to deal with lag at all, but make sure it can’t be hacked.
Danged internet, ruining games.
PK area/server that drops your gears when killed, evil laugh
you always have the appropriate anime image for the reply Melon 
Stable fps like how they look in the trailers
I’ve seen a growing number of users want PK.A server would be extreme,but maybe a map isn’t too out of the question.
Pff,I have plenty that will probably never fit the situation.Have one!

an overpowered solo-only class meant to be hunted by guilds and can take on group content alone.
attack speed
20chars
This again…
What do you think is happening? 
what?! ma-making bab-… what AM I THINKING?
impossibru
A “Marriage System” or something like that 
An option to select a guardian goddess to help you in your path. Each goddess could have their own abilities activated by a random chance. Like reviving you if you die in combat, buffs and other things.
Character customization that is quite similar to BnS.
Weapon remodel system(change weapon appearance)
Punch kick class
A PvP map would be awesome :3! Without any level limitations, so you can kill anyone and get killed by anyone, And with the possibility to hurt your party/guild members, so to limit the alliances walking around and killing everyone who is solo 
However without the gear/gem drop, otherwise it’s gonna turn tryhard.
And also the villages and possibility to decorate your own house/room (each house could consist of like 10 rooms). The houses number would be limited from the beginning and there would be a need to build new ones, which would cost a lot of money and time. You would be able to visit other players, check their furniture, chat in the village…
Such things can really suck in players, I could totally imagine myself looking for loot to build a house/decorate it. Maybe some marriages could be introduced then as well? So you were able to share a room with your “partner”
? People in guilds, friends would join together to find loot to build a house together, there would be an incentive for old players to visit low level maps for the drops as well. But it’s hardly possible, would require too much work and the game itself doesn’t revolve around building/decorating 
Would be great if we could bind UI elements to hotkeys.
… oh, wait.
Anime collab costumes! @_@
