warrior Npc class with
Imp. Unarmed strike.... and
feats that are martial arts like (Complete warrior has a lot of these)


if you need to level 1 monk and level 2 monks work just fine... use the 13,12,11,10,9,8 stats for them (13 in dex 12 in wis 11 in str 10 in con 9 in Int 8 in cha)

edit: is this for 4e because if so, I can't really help due to my unfamilarity with the new system...

but when in doubt make fighters that use primarily unarmed feats and bonuses, give them acrobatics and use weaker stats (like I said above).