Oh! I just had a fun idea! If i may run it by here to be sure, of course. 

The idea is a 'Hero' class, which is a true 'jack of all trades' at its core with an incredible potential variety of martial and magical skills they can learn. If it is a class that exists, the Hero can probably learn stuff from it. They also have great stat growths all-around. 

BUT on the downsides the class lacks any possible specialization in terms of combat skills. In other words, they lack any specialized skills, future paths, passives, or even abilities otherwise to enhance martial or magical prowess. The lesser amount of unique skills or abilities this class gains are basically just focused on increasing their own survivability individually and working with others in groups/teams. 

This literally means any specialist will be doing better than a Hero in the same field. A Warrior will be better in warrior abilities than they are. An Archer will be better in all Archer skills than a Hero can be. A Necromancer or other Arcane Mage might have special skills or abilities they gain as part of their class...but which the Hero cannot acquire due to not being of the same job class. 

That sorta deal! :P