My solo black belt went at 50 and had a rough time reaching the bottom..

the words "time consuming" with the heal staff and defense sword get a whole new meaning.

I've went as low as 24 or 25 i think with F/?/BM/WM
I've went as high as 36 with the same party... was not too hard then

DoS and easy origins I think I was 38 or 39.

Have did a Fi/Th/BB/Rm (distinct lack of healing)
Fi/?/WM/BM just about every combination possible for the ?
BM/0/0/0 Solo BM... died out around Tiamat's place.. cause I got bored/was getting rather rough. Still need to finish.

BB/0/0/0

Think have done some more party types but can't remember.
No NES tho. Origins Normal is decently close to NES though.. not exactly.