My suggestion is from personal opinion on what can steer MapleStory to becoming more fun and lead it to being the worlds best game as it used to be, it isn't very formal or well written but I do hope that it can and will have an impact for future development for classes. So what I believe could be nice for new and old players is implementing a group of classes that can actually combo like Aran so it isn't always press and hold one button, make the classes literally able to combo off of each other at a specific and decisive moment of doing a move like I don't know for lack of examples The Avengers movie where Hulk and Thor had their combo on the Chitauri creature and Iron man's repulsor ray combo with Captain america's shield. And make those classes have specific buffs or passive abilities that only function when you are partied with the specific character listed from the new group of classes as well as having a growth system based on specific boss clears and or leveling to a certain level so that the ability is worth having at it's final tier. Having specific requirements for these passives will shine the light of the history and friendship of these characters and make there lore just as more important as they are fun to play with others. The last quest requirement to make there passive ability work with all the new classes should as well be quite strong so that its worth getting, require that you must be partied with one of each of the new characters as well and make you all group to fight a singular "Final Boss" so that once you defeat the new boss the reward feels more significant and worth while as you will have completed it with others. Note that these classes would also have a unified edge over the boss rather than other classes previously out can still fight it normally because of its drop rewards but wouldn't have a set group buff as these new characters against it (only gaining the buff if they have one of each member of the new class on the team, as well as only capping out for one of each character without duplicates so that it doesn't become to easy), as their passives with one another would either weaken the boss or increase the stats of each other as a whole or give passive negative effects like burn or poison on the boss that becomes stronger against that specific boss. Lastly I want to mention that though these are new characters each of the new class characters would be the type of class from the original types of classes you would see when MapleStory was just starting such as the originals being the explorers. ex. Warrior, Thief, etc.