I wanted to work on Martial Artist/Monk class too, put everything I had in mind on a file but I somehow lost it so I'll probably work on another custom class.
From what I remember :
Skills :
- 3 different stances : Offensive (accuracy + damage buff), Defensive (reflect buff) and Evasive (dodging buff)
- Sweep : AoE leg sweep
- Nose bleeder : sets bleed
- Front kick : single target knockback + knockdown
- Meditate : reduces skills cooldown by 1
- Acrobatics : mobility skill
- Elemental Fist : would work the same as Elemental arrows
Items :
- Monk mitts : buff to unarmed damage
- Master blindfold : sets blind with a minor accuracy & range debuff but stat buff
I hope this gives you some ideas!