Monkeys (or any other creature) with rocket launcher arms.

Just been playing Far Cry?
This is sort of related to the chosen one thing but the player going from complete n00b to superhero over the course of a few days in the game. VTM Bloodlines is a good example

Every RPG, no matter how clever they made the story to fit the grinding and leveling up necessary to advance through the plot and defeating enemies, will eventually get to a point where they just ran out of ideas and just have you go around picking up random fights to level up your character. You usually see this when at some point of the game, your mentor , companion, advisor character tells you that he won't accompany you or help you until he sees that you are capable of fighting the whatever enemies are in the game, and there's nothing but the sidequests you left off and random monster/human killing/looting to do.

Have no idea if these were mentioned:
-Almost EVERY ally or protagonist/antagonist in a JRPG has spiky hair/amnesia.
-The 'you must lose this battle to move on. Seriously, waste those potions and you will regret it.'
-Every enemy in an M game has more blood in their body than an elephant.
-Some evil organization is fighting over this resource, gather it and kill them all in the process.
-Hero's sidekick is usually a pussy/total wimp and talks like a 5 year old.
-Same weapons for shooters that are not Half-life, GoW, or Halo.
-Silent protagonist. You are not a mute! It is obvious since people pretend to know what you mean when you walk up to them. Speak the hell up!
-starting levels give you god like power and then strip you of it.

Or as was in Call of Duty: United offensive (I think) - you and a few members of Dutch resistance are physically retarded, so you can't jump over a 1m high wooden fence, nor open the door there. Instead you have to wait for your squad leader, who opens the door in the fence with a kick.
From WW2 FPS in general:
-if there arrives a German tank (preferrably Tiger), there is always some German anti-tank weapon near you or near the tank
-no matter if you fight against regular Wehrmacht soldiers or the elite SS, you and your squad of heroes kill them always in hundreds

And exactly how much recoil is there in a laser rifle anyway? Even if it fires only short lengths of much-slower-than-light laser beam (always a favourite of sci-fi movies). Must be some damned heavy photons, for your aim to go all over the place.

Fighting monsters is kind of the main gameplay aspect of RPGs to begin with. How is this a cliche if it's an integral part of gameplay for the genre?

It was in the RPG!
Besides I gave a nerd warning

Pretty much what happens in the NWN OC and in Oblivion.

err nwn? you were the central character, hell you were nearly the ONLY character

Those are just examples of following orders, which happens quite often. You're still the one that has to do everything.
In NWN in particular, you often get asked to explore 3 places to find something, but instead of you picking one and other adventurers doing the other ones, you have to do all three...
My earlier post about RPGs was aimed in the direction of the likes of Oblivion. You can hear about all sorts of urgent quests, but if you don't do it, no-one else will.

Not an awful lot you do in NWN OC has much impact on the plot, you are just the errand boy in the service of more important people like Nasher, Aribeth or Aarin. Sure, you grow in power over time, can influence a few things of no great consequences, yet in the end the story isn't about centered about your character.
Same as in Oblivion: the real hero of the story is Martin.

NWN single player campaign is just awful. I've been through Baldur's Gate 1 and 2 dozens of times, I love those two games, but NWN was just a terrible game and the worst 40€ of my life.