My OD&D Encounter SOPs

I've been running Murdicog's Manse with the Underworld & Wilderness Adventures dungeon encounter tables. These provide nothing aside from the type of monster encountered (numbers are my addition). I've been gradually compiling a mental "Standard Operating Procedure" for OD&D monsters that fills in some of the gaps left by their printed descriptions. I thought it worth sketching one out for all the entries on the table, tailored to my preferred sci-fantasy "arcade-mode" milieu.1 Obviously this is nothing novel; I think everyone does something similar when running a dungeon game. But the exercise of writing them all down was fun and prompted me to make some improvements. The following loose SOPs are conceived with three purposes in mind: To inform how I interpret reaction rolls. To give each monster a gimmick or "thing" that occupies their time in the dungeon (what are they up to if surprised? What do they want?). To provide a reasonably well-defined, learnable way for players to reduce…