My most annoying enemy is medusa Head in Castle Vania(the first one), it was sooo annoying, I had to die 3 times to get used to him.

You can post more than one enemy if you want.

One thing that annoys me about The Elder Scrolls IV: Oblivion is that most of the humanoid non-player characters know the same healing spell and WILL--I emphasize WILL--use it right when you're about to deal the killing blow. On weaker NPCs this can restore them to full or nearly full health while you're in front of them bleeding to death and trying to clutch your sword with the finger bones that used to be a hand. It's always bothered me that everyone from mages to peasants know this same spell.

But I can understand that; I don't expect people in a world like Tamriel to go around without some form of defense.

Where it really gets annoying is in the Dremora mages in the planes of Oblivion. Regular Dremoras, in spite of their flash and armor, aren't much tougher than Scamps. However, the mages are super-tough and know the same freaking healing spell, which they can use ad infinitum. This wouldn't be so bad if they were reasonably placed in the game world, but they put two of the buggers in the first Oblivion gate. If you're a Bard (like me) and you're playing the storyline through without side-quests (like me) you won't have enough experience with weapons and alchemy to kill them. I have to run like a little coward, which is really uncharacteristic of an Argonian (like me).

the most annoying enemy was when i was playing custom robo for the gc andi forgot what its called but its this android that abosorbs life.... once i defeatede it however (took me 14 tries my freind counted) the game was easy

ok this isnt really an 'ENEMY' by definition but an opposition....


NBA Jam when your on the fourth quarter, it never fails..... ill be 2 or 3 points down from winning at the Last Possible Minute i hear

"FROM DOWNTOWN" and guess what? They always make it..... pisses me off greatly

A lot of games let the AI cheat because otherwise it isn't sophisticated enough to put up a real fight.

Anyways, I'd have to say the most irritating enemies are Zubat, especially at lower levels. They are fast so you can't run away, resistant to a lot of low level attacks, have supersonic, which supposedly has a 55% accuracy rate but somehow hits you EVERY TIME so you are constantly confused, they give very little experience, and appear every 3 steps in caves.

Elvarg in Runescape... I took me 60k runescape gold, to finally kill it...

Ansem at the end of KH1. I always lose at the very end, and it took at least 20 tries to beat him.

psycho mantis from shadow mosses. opps forgot to name the game metal gear solid

Probably Mazaal from LoZ:The Minish Cap.He shoots 8 of these little spiders that prevent you from attacking.

The worse enemy ever for me was the Chicago Bears in Tecmo Super Bowl. I really hated that team with a passion for whatever reason they always gave me a hard time. And the player I hated the most was Neal Anderson that guy was always running for like 150 yards while I hold every other team to like 50 yards rushing.

"Fake chaos" from Sonic adventure 2 battle , their range is so far , you fight those all the time in the art levels .

And don't forget the flood from halo , it is also an annoy enemy , but fake chaos is harder to avoid because your not allowed to get hit in Sonic or you will lose all your rings (newer games you will lose some not all ) .

Mine are the Bats in Ninja Gaiden, they are annoying as hell

Now, my most annonying enemy is revenent Vampires, because they are lvl 68s and as hard as heck to kill....

The Blue Bird Knights (or whatever their name is) from Zelda II: The Adventure of Link. They can jumpa AND shoot beams from their swords.
If they pin you into a corner or a small area, kiss Link goodbye.

The worst and most annoying enemy for me is the finall boss of assasin's creed 1.
I've lost so many times, because he multiply himself and every time I was about to kill him, he just transfer himself
But I killed him at last

They're small, they're fast, and they can slash your life-bar to nothing in a microsecond. The undead Ghost Fish in Ninja Gaiden make just a few appearances, but their outrageous difficulty leaves a lasting impression. In the first Hurricane Pack, they're practically everywhere. Truly obnoxious.

Also, the Medusa Heads were annoying because their sole purpose is to knock you off platforms...which, in the Castlevania series, spells instant death.

I really, really hate the Ghost fish in Ninja Gaiden, as they pretty much are invincible. I also hate the people that Travelyan sends out in Goldeneye. There is no end to them. I guess those two enemies annoyed me the most, as they are both so annoying, and can kill you.

Anything that cause status effects
Zubats I want to take a shotgun into every cave in the pokemon world and blow their head's off.

my most annoying enemies are Bloopers in the mario series because they just float 2ords ya and Diglett/Trapinch because of that arena trap abillty