Interesting that Mara and Mnoleg, despite being "normal" enemies (as opposed to polymorphed, or random pan lords) only have one kill each. Plus, Mara is generally considered one of the more dangerous enemies!
Wonder how much of that is due to people not running into him, and how much is people nopeing out of there the instant they see him.
Cigotuvi's Monster at least, and cherubs and bennu, probably fall into the "not often encountered" enemies, explaining their solo kills, though it's a little embarrassing to see that ironbrand convokers and shadow demons have only 1, considering how many you'll run into.
Even Dispater and Louise only manage 2, though to be fair, Louise is more likely to kill you via banishment than direct damage. Though it's worth noting that "Gastronok the Shard Shrike" also has two kills!