I've been writing up the monsters for Flying Swordsmen 2E. I have around 50 of them (monsters and animals, not stock NPCs) total, and around 20 left to stat up. I've been basing a lot of them off of the OGL d6 Fantasy Creatures book, but with some modifications to fit the system I came up with for FS2E.
A lot of the descriptions have just been copy/pasted from the original Flying Swordsmen, but there are some places where I've made some changes. One thing I did with the dragons is to make sure they all have some sort of special environmental effects they can create to make fighting them more challenging but also more interesting.
Having done that, though, it makes me realize just how similar many of the monsters are to each other. Similar dice codes for abilities and skills. There's not really a huge range. Most creatures have attacks and skills at around 4 or 5 dice.
I have given special abilities to some monsters, and some also get martial arts Powers and Techniques (Powers are sort of like the Force Skills in Star Wars d6, Techniques are a combination of the martial arts maneuvers and spells from 1E Flying Swordsmen, with a few new things thrown in). That helps distinguish some of the monsters. But I think I need to go through and figure out ways to make monsters more interesting. I think human opponents and rivals will be primary antagonists of the game, but there should be interesting monsters to fight when you have to throw in a monster.