Wind Waker Itemizer is a tool for the original GameCube release of The Legend of Zelda: The Wind Waker that allows the user to edit what pickups enemies can drop when they are defeated.

When an enemy actor is killed, the game rolls a random number between 0.00 and 99.99, truncates it to a value between 0 and 99, and compares that to the chance of the actor spawning an item ball; see the code at the TWW decomp project. If the random value is lower than the item ball chance (drop_chance > random_value), the game will spawn an item ball containing all of the items listed in the Itemizer under Item Ball Contents.

Otherwise, the game rolls another random number between 0.00 and 15.99, truncates the value to fit between 0 and 15, and uses it to choose an item from the items listed in the Itemizer under Loose Items.

Note: There is an explicit check in the code for if the current map is Cave09, Cave10, or Cave11. These three maps make up the Savage Labyrinth. Item drops are disabled in the Savage Labyrinth, so the process described above does not take place in any of these maps.

To summarize:

• How often an item ball drops is determined by a value between 0 and 100. The higher the number, the more often an item ball will appear. The item ball contains all the items in the Item Ball Contents section of the Itemizer.
• If an item ball is not dropped, the game will randomly choose between 16 possible items. The pool of items it can pick from is listed under the Loose Items section of the Itemizer.

Adding entirely new item drop configurations is technically possible, but would require the use of the TWW Decomp Project.. This is because the configuration used by a particular enemy actor is explicitly defined, rather than a consequence of the game choosing the configuration based on the actor's name. Consider this snippet of code from ReDeads:

if (mWhichIdleAnm == 0) {
    itemTableIdx = dComIfGp_CharTbl()->GetNameIndex("Rdead1", 0);
}
if (mWhichIdleAnm == 1) {
    itemTableIdx = dComIfGp_CharTbl()->GetNameIndex("Rdead2", 0);
}

The actor's itemTableIdx is set by calling dComIfGp_CharTbl()->GetNameIndex(), which takes the name of the configuration and an integer value. Using a brand-new configuration, for example named myConfig, would require the actor to call dComIfGp_CharTbl()->GetNameIndex("myConfig", 0); and store the return value to pass to the puff-of-smoke actor when it is killed.