Here's my thoughts for duelist. Trying not to make them too overpowered. Going for a character who uses one handed weapons with no shields, and has major penalties to missiles. As much as I like the idea of disarming, monsters don't carry weapons in ADOM, so don't know how that would work.
Duelists gain +1 extra To-Hit for every rank in one-handed weapons as long as they aren't using a shield (OHNS)
Duelists gain +1 extra To-Damage for every other rank in OHNS
Missile weapons take twice as long to increase marks and have half range.
6 - Base attack is reduced by an extra 10 energy per rank in OHNS
12 - Gains two free levels in the most advanced one-handed weapon skill.
18 - Glove slap - Giving an opponent a pair of gauntlets will stun them for 1d3 turns.
25 - Receives +2DV for each rank in their OHNS weapon type.
32 - Base attack cost for melee attacks with OHNS is reduced by an addition 10 points per rank (total 20)
40 - Receives +2% armor penetration on critical hits per OHNS weapon rank
50 - Receives 4 free ranks in all one-handed weapon skills.
Skillset:
-Athletics
-Dodge
-Find Weakness
-Healing
Crowning gifts (or similar...):
-Ironfist
-Kinslayer
-Bugbiter
-Serpent's Bite
-Trusted One
-Executor
Chaos Knight
All attacks have a 50% chance of corrupting an opponent.
Chaos knights permanently have the effect of an amulet of chaos equipped, drawing their alignment toward chaotic (and damaging them if lawful).
The background corruption rate for Chaos knights is 2x as high by default.
6 - Chaos burst: Chaos knight gains a temporary boost of +2 to each stat for each corruption he possesses at the cost of ~0.5 corruptions. (That is, like a potion of boost -stat-, needs to be activated)
12 - +2DV and 1 PV for each corruption.
18 - Transmute corruption: The two most recent corruptions are removed. Three new ones are added in their place. (Needs to be activated)
25 - Chaos knights can take on three additional corruptions before becoming a WMoPC. Background corruption rate is redoubled.
32 - Every time the chaos knight receives a corruption point, he also recovers a point of HP (but PoCC/SoCR now do damage...)
40 - Chaos knights can take on seven additional corruptions before becoming a WMoPC (10 extras in total).
50 - All positive bonuses received from corruptions are doubled in strength
Skills:
-Alertness
-Backstabbing
-Detect Item Status
-Metallurgy
Crowning Gifts: A bunch of artifacts of varying quality that carry the Essence of Corruption, of course.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.