Modesty can be an unusual trait for a character. Most players prefer to think of their characters as outwardly self-confident or even braggarts. This is fine for a heroic setting in which the PCs are true heroes and some of the most powerful people in the land. But even then modesty in certain situations can add interest and have benefits.

And then there's the flip-side of modesty: smugness. Perfect for annoying villains.

For variety, try reversing the roles and have smug heroes and modest villains. Just think about that for a bit.

Transcript

[SFX]: roll roll roll roll roll roll roll roll roll roll roll roll roll roll roll roll {scattered around a TIE fighter}
Luke: <roll>
[SFX]: KABOOOM!
[SFX]: < kap whree kap bip doing fidooby >
R2-D2: Three from three. Just one left.
Han: Great, kid! Don't get cocky.
Luke: <roll>
[SFX]: < whirdle-ting eebloo blip >
R2-D2: Flee! Flee! Suckers.
[SFX]: KABOOOM!
Chewbacca: Passengers, if you look out the starboard viewport you'll see the exploding remnants of the last pursuing enemy ship.
Han: R2! Scoop up the debris and filter it for loot.
[SFX]: < pip whir >
R2-D2: Already on it.
C-3PO: Han, I thought you were supposed to be the hot-shot pilot.
Luke: Well, they were much bigger than womp rats.
Leia: Not bad for a farm boy.
Luke: Aw shucks, 'tweren't nuthin'.