i'm planning to make a bestiary or something that gives some examples of enemies but for the moment they basically just need HP + Armour (if they have any) + Legs figured out along with whatever they have on them. from that point, i'd only note down any stats that are likely to be relevant. like if they're a spellcaster you should give them a brains stat, or if they're a sniper you should give them a fingers stat and so on.
hope this helps. if you need, i can jot down some examples lol.