while i would like to see a lot of things in the game, most of them are mentioned already xD but to keep my opinion clear i'll post it anyway
1)emotes, always change the day and social chats become even funnier.(this includes dance and the affection emotes too)
2)trade forcefully made without involving ryou unless as a tax, the more you want to give, the more you have to pay.
3)clothing for ryou, so the anime ones will be for cash shop. (?)
4)coloring clothing.
5)tamable monsters, i'd like to run around with a fluffy leafy ball (kijimuna).
6)chat customizable and this chat form groups like clans or guilds.(this way if you made a chat it also works as clan or guild)
7)housing: but just instance generated and work like temporal rift, the requirements to hold a house may be shared with the group wich made it so this way the house becomes of the group, also if there's a benefit (like buffs) for visiting a house.(continue at point 8)
8)mini-games: may get very trendy if the housing system is shared, and putting the mini-games inside. the bigger the house, the more mini-games it can have. as prize of the mini-games it also can get to be food items, materials and random stuff :3
9)npc duration: i have nothing against this system except that i haven't found a way to recover the duration they have for deafult in a quicker way, just waiting like an hour to be filled up again is tiring and makes me thing of better not summoning any npc.
10)partner stance: switch between attack and defense with one button, so if you need cover your partner tank while you heal, and when you are ready to strike, go on with the offensive.
11)same skill, same progress: the skill list was very wide, but when i saw i had like 4 "thrusting" II skills and i thought ":yaoming: i'm not leveling skills then xD"(can't remember the name of the skill but it was thrusting skill)
12)no weapon: i know, is just impact damage, but this way we can save durability of the weapons at the cost of using only oni skills without buffs for them or adding fist as a weapon.
i think this is all i wanted to see but not sure if it is all, thx for reading and hope someone else reply.