wingnut the improbable
Relating somewhat to Dezman's point on elves:
Goblins are the complete opposite. They smell gross, are unhygenic and messy, and they have the mental capacity of a slime mold. A goblin with table manners? STOOPIED!!42!!!1!!!
Goblins also always come in swarms of ten or more because they're basically meat shields for some bigger, worse guy.
Always work the encounters with bad guys as a video game would. The big villain always underestimates the good guys, so he sends out a wimpy, little agent to take them out. Then these agents gradually increase in power and even size, sometimes with their own groups of lesser minions to weaken the strength and defenses of the good guys (which, as covered before, actually increases greatly right at the last moment to save the day). Do this a good hundred or so times until the good guys finally reach the main baddie.
Going off of that, the main bad guy has multiple forms. God forbid he just keels over after being shot in the leg! No, he must become pissed off and... and... and grow wings!
Black wings! And his dark powers shall increase dramatically! And just keep adding things you see in Final Fantasy games with exclamation marks at the end of the sentence! But, remember, the good guys
always triumph, no matter how powerful the bad guy gets.