ALL enemies will drop random loot at the end of each 'wave'
Heartless drop munny with the following calculations:
Heartless : [Total HP*Number of hits to kill/{amount of damage dealt to killer}]
So, for instance, a lvl 1 battles a 50HP shadow and has no armor. it takes them 5 hits to kill and they take 5 damage. they would get munny like this: 50*5/5 (or, 50 munny)
If they have on armor they would have gotten 250 munny because they wouldn't have taken any damage.
Nobodies (which use more magic then most heartless) drop munny with this:
Nobody: [Total HP*Number of hits to kill/ (1/10 of nobody's remaining MP]
So if a lvl 1 battles a 50HP/100MP dusk with no armor, they would get munny like this: 50*5/6 (dusks have 1 spell, which is their main attack and costs 10MP) they would get 42 Munny.