Classes/Professions

Non-Spell Users   Semi-Spell Users
Fighter           Ranger
Rogue             Paladin
Warrior           Adept
Soldier           Monk
Swashbuckler      Warrior-Mage
Sage/Tradesman    Bard
Thief             Dabbler       
Warrior-Monk      

Pure Spell Users
Magician      Sorcerer      Druid
Illusionist   Mystic        Shaman
Priest        Warlock       Magus
Mentalist     Seer          Alchemist
Healer        Astrologer    Enchanter
Lay-Healer    Necromancer   

This is a list of the character classes I like to use, make available in games I run. It follows the general concept found in Rolemaster of categorizing professions generally by how they relate to magic-use. These 'class concepts' are drawn primarily from 1st edition RM (and the Companions - many of which are really great RPG books in a ridiculous feature bloat/cool idea way).
The presence of magic in fantasy games is really totally fundamental IMO. You can run a high-magic campaign, a low- or no- magic campaign - but EVERY campaign has to define it in some way. So it makes a convenient starting point to conceptualize classes/professions (among many other things)...
But I don't develop characters as RM characters - it just takes WAY TOO LONG. I use them as guidelines and write them into the campaign - usually using whatever base spell lists and skill group bonuses (as wonked into my game). I do run separate 'realms' of magic (a la RM), but default to magic just being magic when it is too inconvenient (example: 'detect magic' in RM is split into three (really more) spells, one to detect each specific realm - too much for me).
I used to have a much larger list of 'Non-Spell Users', but it's just too easy to get way too ridiculous - and this list (Pure-spell users particularly) is close enough.
I used to have this NSU/SSU/PSU profession-group:
laborer/tinker/architect (!)
Wonder why I've developed in a vacuum so much of my life?