There are a few things that I think would help make the game more fun and easier to play with friends and less frustrating playing solo.
Make the friends list global, every time I make a new character, I have to arrange to meet friends and add them to the friends list. One list for all 6 would be great. Also, when I've met some players out in the game who needed help, it would be easier to help with a character I'm not on. It would be nice to be able to friend someone and then switch characters and port to them to help.
The Fantasy Palace PvP arena - Make it give you the option to summon a random "monster" to practice on when you enter the ring by yourself
If you delete a character, allow his/her house to be put in the shared bank, even with a "Crowns Sale" a house that costs 10 or 15, 000 crowns is $10 or $15 in real money lost just because you decided that Fire was boring...
Allow non-enchanted treasure cards to be put in the shared bank so you can craft cards for your other characters without having to get a 2nd person to be the middleman, not that I don't trust my friends to actually give me the cards back, It's just that I am playing from about midnight to 3am lately and nobody's awake
Allow trading of reagents, I have a friend who's working on the same project I am, I have extra springs and she has extra black pearls. Yes, there would be fewer reagents in the Bazzar, but it should cut down on the competition and realm-hopping for them in the wild. So, hopefully, more people would be able to finish crafting projects.
And as I said in another post, to encourage level 50+ players to help lower level players, make another set of badges or ranks for players who help out in the lower levels. When I was hunting for Mandrake, there were days that I went through sunken city 3 or 4 times because someone asked for help. I got some pet drops, mandrake and bloodmoss, but a badge that says "Hall Monitor" or something would be fun. Maybe players with the special "assistant" badges could be clicked on the same way you would to add a friend and the option "ask for help" would come up and the assistant would get bonus drops or something for helping.