Favorite Monster Overall.
My favorite monster of all time, in all editions and remakes like Pathfinder. This one is tough, I think the best way to think of this is what kind of monster do I always make sure to use because I find them so much fun.
In answer to that question I think that my favorite monster would have to be the Goblin. I know they are small and weak, they offer very little challenge to the party but at the same time I just cannot use enough of them. In Pathfinder the Rise of the Runelords Module the Dungeon Master is encouraged to role-play them as psychotic, addle-minded creatures.