This meme is floating around the gaming community, so I thought I'd do it here.
10 Monsters I Love Using, and Why (In No Particular Order)
1. Elves: I like using regular ol' high elves a lot. They make good enemies, at least the way I run them - aloof, convinced of their superiority, and often extremely well-intentioned.
2. Dogs: I like the idea that, in a land of adventure and mystery, there are still people who train big ol' attack dogs. Dogs are a threat that the players can identify with more easily than anything else on this list.
3. Zombies: Who doesn't like zombies? They're great generic bad guys.
4. Oozes: Creepy, inhuman, hungry, tough. Oozes.
5. Mummies: Undead warrior-priests with a vulnerability to fire are a good fit in many campaigns. Very dangerous to an unprepared party, but they have a vulnerability that many players can latch on to. They also often hang out with nos. 3 and 4.
6. Cultists: Sometimes I don't feel like making a villain with emotional underpinnings and human vulnerability. That's what zealots are good for.
7. Tree-people: All kinds. Ents, shambling mounds, animated christmas trees. They're fantastic allies and powerful enemies and they represent the raw fury of nature many times.
8. Gatormen: Alligator guys are slightly scarier than the more generic "lizardmen," merely because they paint a better picture.
9. Drakes: All the power of a dragon, none of the negotiation. Excellent when paired with cultists.
10. Ghouls: They're like a Zombie +1, and they have a creepy paralyzing ability. Additionally, they retain enough mad intelligence to lay traps, lie in wait, and even capture party members to use as bait.