Quick fun question for yall: What are your top 3 favorite enemy types to use in games? And do your players know to expect them?

My top 3 favorite enemies are always:
1) Undead
2) Regular humans or humanoids
3) Plants

My players know there will always be undead somewhere lol

@Miru
1. Kobolds. Seriously fun when you play them like the cagey devious little b@@@ they are supposed to be. Never a toe to toe fight with then.
2. Undead. I can get my smart scary villan and shambling horde all at the same time
3. Fae. Glamours and illusions galore