Wanamingo.

Damnit, why did you guys have to die out.

I'd probably say death claws because they can always be a challenge but since other have said that I will spice it up with aliens. The fallout 3 mothership zeta dlc was memorable and a cool experience as it was different from anything you saw in the capital wasteland. Sad they didn't show up more in Fallout 4 or NV.

My personal favorite are the deathclaws

Deathclaws, with no doubt, they are freaking killing machines.

I have to say most of them but the Mutant Bestiary ( I know it's more a categorie than a creature ) is the most iconic. I loved the first Fallout for that. The first time I left the Vault 13 I didn't know what mutated nightmare the wasteland could bring to me.

I still remember the first time i saw a deathclaw... "What in the fuck" *dead*

Definitely a death claw. I remember being afraid to travel too far north in fallout 3 because of them. My jaw hit the floor the first time one of them picked me up in my power armor and tossed me across the road in fallout 4.

Cazadores, because I'm a masochist.

Nightstalkers, because they're adorable.

It's gotta be those weird creatures, what are they called? Wanamingos, fucking hilarious as hell! I have them in my FNV TTW modded game, and everytime I'm in either wasteland, I'll see them run across a highway and ambush a bunch of raiders or NCR and the way they run is just freaking hilarious.

In all honesty though, my favorite before the Wanamingos has to be the Geckos, when I first played FNV, on the road to Primm, I saw that stupid run the geckos make and goddamn is it hilarious to see them chase after a radscorpion or take down a human NPC as a gang, but they get scary as you go further east so my dislike for them grew and so did the number of times I'd take one of their heads or their limbs.

I really like deathclaws. Sure they are hard to kill, and kill you easily, and haunt your dreams, but they are intelligent, and even formed a community in a vault. So you can't help but have a soft spot for a creature that is the combination between a lizard and a wolf.

I'd have to go with Wanamingos as well. Out of all the creatures I can think of in the Fallout series, they are simply the most alien. They're so bizarre and mysterious looking, that I think it really adds to the fear of running into one.

@TheRatDragon
You know, I've been playing New Vegas since the day it was released, and in all that time i'd never seen a gecko swim, until a couple days ago. And.. oh boy. That had to have been the funniest looking thing in all of New Vegas. It swam as a gecko probably would. But seeing it in game was just fantastically hilarious.

TheRatDragon wrote:

In all honesty though, my favorite before the Wanamingos has to be the Geckos, when I first played FNV, on the road to Primm, I saw that stupid run the geckos make and goddamn is it hilarious to see them chase after a radscorpion or take down a human NPC as a gang, but they get scary as you go further east so my dislike for them grew and so did the number of times I'd take one of their heads or their limbs.

I can’t believe I forgot about those guys. It’s been such a long time since I played New Vegas. I think it might be time to add it to my to do list.

Cassadors are just so nice and deadly, always love that gaming adrenaline rush you get once you see one flying towards you on low levels.

Super Mutants , nothing was more interesting then having to fight a Super Mutant with a Gatling laser just felt like they belonged in fallout.

@Diego Javier Noguera Rico it's "Cazadores" in plural, since "Cazador" is the spanish for "Hunter"

My favourites are the Centaurs, it's just creepy to know how they were made and what are they made of.
The Ghouls, my favourite one is Raul Tejada, they're very interesting beings, specially the older ones, since they can live centuries(obviously drinking and eating like normal living beings, btw fuck you bethesda) they have great stories to tell.

And the good ol' Muties, from the smartest to the dumbest, all of them are a tough enemy and the friendly ones are always awesome to interact, i remember when i played fallout 2, in Marcus former town called Broken Hills, there was this mutant that you could talk and bet him to play armwrestling, if you hadn't enough strenght he wins and then preceeds to have sex with your character lol, you even wake up with a ball gag in you inventory. aaah the good old days.