Character Classes

Fist time I'm writing anything here. I've been reading a bit about coldstone and it looks
very cool.
I was thinking of creating a game where you wouldn't start as a specific class (ie you can't decide to be a paladin, thief, mage etc in the beggining) instead you'll have to join for example a paladin order, a thieves' guild or the army to train yourself as a class. Those you're learning from would then teach you new skills, spells etc. You could also become commanded to perform quests for the guild, and if you do this well you could become general, commander, masterthief or whatever and command your own forces.
Do you know if it is possible to create such a class-system?
And btw, do you think it's a good idea?

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Frĺn var och en efter förmĺga.
Ĺt var och en efter behov.

I think it would be possible, though not necessarily simple or easy. Worst case: you make a separate character for each class and then swap one of them in for the normal character. This wouldn't work very well (for instance, once you switched to a particular class, it would be very hard to switch back), but it would work. Hopefully there will be a better way to deal with this (events that change the abilities gained per level, for example), but I can't say anything for sure about that, being a newbie here myself. In any case, it is (imo) a good idea, and indeed I plan on doing something slightly similar.

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Actually Wyvern, it is easy and can be done. You would just need to use different events that would take place at say, the end of a mission, in which you might get a reward such as a level or spell up. Very simple,

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Was it the Chad?