I've whittled it down to two choices for a no levelling run
Thief
-means going pure dex with 2h other weapons
-can use magic weapon and soul arrow
-two starting gifts
Hunter
-access to more, bigger weapons
-loses access to magic
It all comes down to how much of a difference Magic Weapon will make
Seán
Considering one of two things
-A SL1 run of DS1. I've never done a SL1 run of any Souls games but DS1 seems the most reasonable but very restrictive
or
-A no levelling run of DS1, which I've also never done, but is likely much easier but far less restrictive since I can choose any class I want