What're the least and most lore-friendly jobs for an RP character to have?

[Jandor]

What I mean is, your average joe isn't going to become a gunbreaker. There's not a million of them running around. If I remember correctly, your job trainer is supposed to be "the last one" until you become one.

Gunbreaker actually seems like one of the easier jobs for an average joe to pick up, the lack of trainers and weapons is definitely the main bottleneck.
The actual art of 'Gunbreaking' definitely strikes me as one of the easier ones to learn though, you don't need to remember a bunch of ancient incantations, bathe in demi-god aether, or master your inner beast/darkness/dragon/etc. You just need to know how to swing a sword and make sure you have some sticky labels for your various cartridges.

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As for other players out in the world and such, I don't know, people often seem very rigid in their thinking on this.
A bloke with a big two-handed sword doesn't have to be a Dark Knight specifically, they might just be a bloke that knows a bit of magic and can swing around a big two handed sword pretty well.

That's my take on it anyway, the other people knocking about are not the super special chosen one, but they are very very good at what they do and at a glance it does look very similar to what I, the actual super special chosen one, can do.