I decided to go with the path of not selecting your class. Lots of RPGs, especially Byond ones, tend to use a straight forward system. You are a soldier or you are a wizard so your character will develop as follows. Players will want more options and usually this is handled by adding more classes. Soon there are too many classes to keep the game balanced and you still aren't making everyone happy.
This system is a make your character the way you want. As you level you get stat points, one for each level. You may choose to place these in any of the five main stats of your character; Str (increases your attack damage), Agi (increases your odds of going sooner in battle), Vit (increases the amount of HP you get at level up), Int (increases your magic damage and MP you get at level up), Spr (decreases the effect negative magic has you by effect and damage).
As you raise your stats you will see one of four classes appear in the menu for gaining new skills. The AP you gain from leveling can be used to level up these class skills. Warrior, Rogue, Mage, and Cleric just like the old Dungeons and Dragons 2nd edition. If you spend enough points (2 at first then 5 for next and 9 for after that and so on) you will gain a level in that class. This unlocks new skills to be learned from that class.
You then can spend your AP on gaining skills associated with the class you leveled in. As you level that class more and more, the better skills you can attain. Some skills can be learned by leveling in more then one class too. If some great new skills are thought of later and you are past the point you would unlock them you will not miss out as they will become available once put in the game. This system should help defend against pwipes in the future.
Now the player has more control on what type of Wizard they become. They don't have to be the frail can't fight type of mage, but could be a mix of healing magic or a magic using knight.
Each class has it's own type of equipment skills that can be earned too. Warrior having the most as they specialize in combat.
This is a simple system as the game's theme is too feel like a retro RPG from the early 90s. No two characters should always be the exact same. Characters should have some kind of personality to them that is all their own and this system can give that opportunity.