Alzrius
The EN World kitten
Stalker0 brings up a good point. In most sagas where the hero has a special (or signature) ability, we see that ability be used over and over. If anything changes, it's either the context (e.g. firing an arrow right in the guy's face instead of from 500 yards away), or they simply gain another, different power.
The problem with Stalker0's examples is that they're illustrating a point that's a truism, but for another genre. Superheroes, as a general rule, don't operate on the step-progression that D&D characters do. When is the last time Superman or Spider-Man gained new powers (permanently, that is)? They might get better at using their existing ones, but that's not nearly the same thing. Inu-Yasha follows an example that's mostly similar; he has only a small number of new powers that he gains/unveils over a relatively long time...closer to how a D&D character works, but still more superheroish.
D&D characters go through a charted course of power-ups and progression. A 1st-level PC's player knows (even if the character doesn't) that he's just started to tap into what his PC can do. At higher levels, this manifests as a desire to try new things to illustrate that the character has gone beyond the limits imposed on him before. Spellcasters pull out new and more powerful spells. Combatants have new and more powerful magic items. Having to stick to an older attack form overly much is an indicator that your character hasn't progressed.
Ultimately, this is a good example of a difference between fantasy heroes and superheroes.
The problem with Stalker0's examples is that they're illustrating a point that's a truism, but for another genre. Superheroes, as a general rule, don't operate on the step-progression that D&D characters do. When is the last time Superman or Spider-Man gained new powers (permanently, that is)? They might get better at using their existing ones, but that's not nearly the same thing. Inu-Yasha follows an example that's mostly similar; he has only a small number of new powers that he gains/unveils over a relatively long time...closer to how a D&D character works, but still more superheroish.
D&D characters go through a charted course of power-ups and progression. A 1st-level PC's player knows (even if the character doesn't) that he's just started to tap into what his PC can do. At higher levels, this manifests as a desire to try new things to illustrate that the character has gone beyond the limits imposed on him before. Spellcasters pull out new and more powerful spells. Combatants have new and more powerful magic items. Having to stick to an older attack form overly much is an indicator that your character hasn't progressed.
Ultimately, this is a good example of a difference between fantasy heroes and superheroes.