The chars i usually make for chaos run are
-Summon necro with Corpse Explosion
corpse explosion will literally wipe out all the mobs in 1/2 explosion making it very fast if you can get the mobs to ball up (which skeletons do really well at)
for diablo use a clay golem which gives diablo a slower attack speed pair that with the freezing of your skele mages Diablo will be very easy then.
-Bowazon with lay of hands glove you get 300% more damage against demons,
the reason i go with bowa instead of java zon is that for phys immies you can switch to magic arrow and bypass that protection. Also mutli shot will clear the sanctuary very fast if you have good gear.