lets see...i would either be a rebel from hl2 who thinks that personal space is overated in urban combat and abusing the lack of friendly fire by running in front of every goddam bullet you shoot or a combine who has some sort of fetish for explosive barrels and is never seen without them.

Hm, dunno. Probably a random fool walking around in a drunk haze but when you get near me I'll take your head off with my 50" longsword, then chop it up into sand-sized bits.

The Combine from Half life 2.

Think Slippy from lylat wars ... although if there was any way to be more annoying I'd go for that. Alternatively one of the nameless bad guys that run in and attack the hero one by one and get butchered in inventive ways to show how badass he is.

I'd be that jerk vendor just before a boss battle in RPGs who sells the best/ the crappiest equipment and ungodly prices.

"you'd like a rusted broken butterknife? 60,000 gold and your soul please."

The guy who breaks the fourth wall with the only line he has in the entire course of the game.

"Your princess is in another castle!"

Or... one of the NPCs from Psychonauts. Any of them. They're all so freakin' awesome!

I'd be really average looking so you couldn't remember if you talked to me yet or not but when you talk to me again I would always say the exact same thing and it would be like 8 screens of really boring text that is insignificant to the plot that you can't skip through

Toss up between trainer and quest giver, probably end up doing both.

<<Welcome, young <class>. I sent for you because your power is growing, and you will be needed in the struggle against the <thing> wrought upon us by the <enemy>. Learn your lessons well, and we might just prevail.>>

"We might just prevail" means that we are locked in an eternal struggle, except in the occasional cut scene where someone wins something.

Re-occuring neutral bad/good guy making it hard for you to know if I'm good or bad.
But everytime we meet, we will fight and you will win. That is until our very last fight when I unleash my most powerfull moves against you which one-hits you but it's all a part of the storyline of course!

Then during the final battle against the last boss, when you are about to die eg. brought the boss health to value-X, he will regenerate to full health and obliviate your whole party kinda in an cutscene. Just when he is about to crush you, I'll turn up and block his attack and everyone will be "Whoooaaaa!!" over that. Then I of course kill him with 1 attack. Then the whole place will start to expload as classic cliché and no one will know what happened to me.

Then in the second game, if you have a save file from the first game, you'd start the game with my ultimate attack! Cool huh?! And of course, a mini-game where you catch up what happened to me.

-nods-

It'd be the awesome.
Or I'd just pilot the Granzon, that's fine too:
http://youtube.com/watch?v=oFYB7-y66jg

im the guy who owns the shop that stocks the item you need for a quest. but of course i wont sell it to you cuz im a jerk. and well you have to kill me to get it. but welll.... that sok cuz im A jerk to everyone , and everyone kills me. thats just life for an NPC

Thats easy I would be Scissorman from Clock Tower. Just imagine it

Iwo uld beon eoft hebi zar rec it iz en sof Moo nsi defro mear thbo unda ndta lkgib be rish alld ay.

I'd be Liu Kang's evil twin from Mortal Kombat (I get asked this alot... No relation.)

I'd be the wandering Item/Weapon sellsmen/bot that would somehow find myself halfway into dungeons looking for (Someone special/device/treasure) and take the time to sell items/weapons to you. While needing to be rescued/released from traps half the time who would later save you in a near fatal event.

Anything invulnerable. Preferably with annoying repeating lines.

I'd be the snot nosed kid from Wind Waker that follows you around, but to the extreme.
Replace snot nose with one line to repeat over and over, and following you around a few feet to stopping at nothing to ensure that I'm with you on your journey. And I'm immune to your attacks.

cyber95:
I'd be the snot nosed kid from Wind Waker that follows you around, but to the extreme.
Replace snot nose with one line to repeat over and over, and following you around a few feet to stopping at nothing to ensure that I'm with you on your journey. And I'm immune to your attacks.

Hi Navi!

I would be the merchant selling the best equipment in the game, located in the middle of the final dungeon. Just to see the player question how I'm able to even be there.

"Thank you Light Warriors for rescuing the princess!"
That would be me.
That, or one of the NPCs in one of the village who don't tell you anything useful and walk around getting in your way, blocking the entrance to the store.

Necrohydra:

cyber95:
I'd be the snot nosed kid from Wind Waker that follows you around, but to the extreme.
Replace snot nose with one line to repeat over and over, and following you around a few feet to stopping at nothing to ensure that I'm with you on your journey. And I'm immune to your attacks.

Hi Navi!

Also, I would react to being hit, but never actually get hurt by it. This will either incredibly frustrate players, or allow them to take out their anger.

I am Barney Calhoun.

A Grudge Monster.

That's nothing to do with the Sarah Michelle Gellar film, it's an old Pen & Paper RPG device for letting you know the GM is pissed off at your interpretation of his world as a free-roaming funhouse as opposed to the linear structure he put together where there is 1 (Und precisely vun) way of doing anything. Essentially a randomly placed high-power nasty popping up should you go too far of the beaten path of the adventure.

I have seen them implemented most effectively in computer games though, and a big monster is a less contrived way of railroading a PC than the unclimbable ledge, inoperable door or "the ground stops here" obstructions some folks use.

The show-off enemy soldier in a FPS who doesn't have the quiet decency to die quietly but has the pressing need to flip over the second floor railing of a balcony onto the ground while crying "agghh, hrrr". Thud!

I'd be one of the people on the audio recordings from system shock 2.

one of the ones that die shouting "No, don't eat my legs *shotgun blasts* theres too many...!!"

then you find my corpse later and take my shotgun

I'd be the stupid FPS medic, the one you have to give a healing command more than three times to before they start healing you.

I would be the bum in Max Payne, wittles on about being in the police force and generally mumbles. Then when given a gun LET THE ASS WHOOPIN COMMENCE!

I would be Morte, the floating skull from Planescape: Torment.

I'd be Majora. I always wanted to be able to fly and do that crazy scream.

Beautiful, cold, brilliant sorceress responsible for a good chunk of the pain and suffering in the game, though ultimately defeated due to short-sightedness regarding some not-so-loyal minion or risky device of power.

Zeithri:
Re-occuring neutral bad/good guy making it hard for you to know if I'm good or bad.
But everytime we meet, we will fight and you will win. That is until our very last fight when I unleash my most powerfull moves against you which one-hits you but it's all a part of the storyline of course!

Then during the final battle against the last boss, when you are about to die eg. brought the boss health to value-X, he will regenerate to full health and obliviate your whole party kinda in an cutscene. Just when he is about to crush you, I'll turn up and block his attack and everyone will be "Whoooaaaa!!" over that. Then I of course kill him with 1 attack. Then the whole place will start to expload as classic cliché and no one will know what happened to me.

So...you want to be the dues ex machina made flesh incarnate and defeat both the players and the Big Bad?

The Happiest Littlest Rebel Against The Combine Overlords. Cheerfully pardoning myself as I constantly lunge at Gordon Freeman during heavy guerrilla warfare situations.

I would be the invincible NPC that sells weapons but if you attempt to hurt me I relentlessly chase you down like the scum you are!! (Whoa blood rush!)

I would be the evil villain who dies in one game only to come back with genetically enhanced superpowers later who also has no real motivation other than money and being an evil bastard. AKA: Albert Wesker.

I would be Timmy the smartie. Completely useless in most ways and occasionally funny.

Probably Malus from the N64 castlevania, purely because i loved listening to that little emo vampire play the violin at the menu screen.