Actually I'd make a spin on Groteske's post.
Either:
Mercenary --> Knight
(Ends up with really high HP and Armor values so it's easier to survive, also Blades are very expensive classes)
Or:
Assist --> Ringmaster
(These're the healers in the game, they're probably the best for levelling and survivability purposes because...they never take damage xD the just heal :P)
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