@McFazzer In my personal opinion, stuff like stats, exp, etc is far too heavily scrutinized in rp, it makes it unbearably dull and takes away the fun of it all. To answer you're question, Azga's been a level 3 for a minute. Whenever a character accomplishes a tough feat, like taking down a big foe or something, that's the only time I'd ever consider leveling up a character because without the need for numbers it proves that they have gotten stronger as both a person and a fighter.
Though considering classes exist there's different ways to level up for each person. A healer/witch doctor like Azga doing a mass heal when usually he couldn't for example could be one of those things. I'm none of the GM's though and that's just my personal take on it. I despise working with numbers when I rp. I come here because I HATE math in general anyways x-x