After killing 1000+ named across a few players - less than approx 20 times have our group seen "no item dropped".
Almost all named have 3 (common, uncommon, rare) or 4 (common, uncommon, rare, ultra); or some variation of perceived drop %'s.
The NPC's we have seen "drop no item" are all NPC's that have had items patched/fixed/adjusted.
Foreman Mirt`akk - Vial of roiling gas adjusted
Grand Lorekeeper Kino Shai`din - SWC removed from drop/cloak adjusted
Grave Master Zo`lun - BST arms removed/hammer made lootable
Arch Inspector Nibi`zi - Earring adjusted
On multiple occasions these NPCs have had no item dropped on kill. Should the % breakdown on the multiple drops a NPC has ever result in "NO ITEM"? I can find no evidence in era that sometimes Named NPCs in Chardok did not drop an item.
See image of an example of Inspector dropping no item.
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Also, 'https://wiki.project1999.com/Conglaciation_of_Bone' does not yet appear to be dropping and should be dropping, as all other updated spells are in game.
Lastly, Wraith of Di'zok Hero has no itemization. This may be correct, however there are few (if any?) comments/notations regarding this npc pre 2002. Perhaps he was added later for one of those "unfinished kunark quests"