As for 'Old Fish' (Old Trout)
I have him as a Fighter 4/Rouge 5/Expert 3
Not an optimum build but fits with the character, and I have no intention of him entering combat with the PCs.
Something akin to being a very low profile version of the 'Grandmaster Torch' of Riddleport.
Not a lot of magic items but LOTS of unique special items he crafted as well as multiple types of poisons