a few JADE ideas,

races,
goblin
minotaur
black hurthling

classes,
Summoner,
a casting type class with bonuses to companions
engineer,
can build mechanical minions from machine parts,can build traps, can build doors.
alchemist,
gets more recipes from alchemy, can brew potions that explode when thrown, can turn water into holy water for the price of one permanent mana loss. (semi-permanent).

weapons,
Shuriken(throwing stars)

skills,
fishing,
can fish for food
masonry,
can build walls

misc.,
randomly generated open caverns in dungeons,
slim chance to encounter randomely generated ratling trader in dungeons
a guaranteed pet shop

spells,
Improved acid ball
Improved ice ball etc.
Animate wall
Rain of fire
similar to earthquake covers the whole map ( randomly casts "burning hands" around the dungeon)
Summon rats
summons giant rats to fight for you (all adjacant squares around you)

these are just a few i thought of