Other films like Shanghai Noon (2000) and The Seven Faces of Dr. Lao (1964) also blend the Western with Martial Arts and Chinese Magic. While a Shaolin Monk might be out of place in Magical Medieval Europe, it actually seems like it would be a good fit for a Dark Fantasy Western!
Here's my first crack at a Monk character class.
Shaolin Monk, Martial Artist
Hit Dice: d6
Armor: No Armor or Shield while using Monk class abilities
Weapons: Roll up to d4 damage for weapons
Martial Arts Attack: Attack does d4 damage (+1 dice at Levels 3,5,7,9) counts as 2 "weapons"
Martial Arts Defence: Armor Class is 8 (+1 at Levels 2-8)
Mental Discipline: +2 on Saving Throws against Mind Attacks
Climb Walls: d12
Slow Fall: Avoid damage for each 10' fallen when near a wall by making a d4 save (+1 dice at Levels 3,5,7,9)
Meditation: Spend an hour each day meditating to regain d4 hit points (+1 dice at Levels 2,4,6,8)
Note: This class is using some new rules that I'll cover in future posts!
I'm not sure if any of the players will want to play a Monk, but I think they add a lot to the campaign setting and suggest other elements to add as well...