If you accidentally let one of your players play a character with a lot of power, it's inevitably necessary to do something to rein that power in, to prevent the player getting a megalomaniacal complex. Well, more of one than usual for a PC, anyway.

When you think of a way to justify limiting the character's influence, you have to make it clear to the player just how limited they are, by giving them tedious administrative tasks to do, rather than allowing them to dictate anything they want.

You can guess how well this usually turns out.

Transcript

Lieutenant: We are making our final approach into Coruscant.
Padmé: Cool. I'm the Queen, right?
R2-D2: Oh great, royalty again.
GM: Your... term expired and you've been appointed Senator for Naboo.
Obi-Wan: The Queen's term expired?
GM: She was elected, remember?
Obi-Wan: Oh, that's right.
GM: Anyway, you're flying to Coruscant to vote on the issue of creating a Grand Army of the Republic.
Padmé: Awesome! I'm in favour!
GM: It's an unpopular bill. It could lead to open war with the Separatists.
Padmé: We need an army then!
GM: The Separatists are a non-violent political movement. This could push them to take up arms.
Padmé: We should have had an army ages ago! I was the one who introduced this bill, right?
GM: Er... okay... Sure. But—
Padmé: This is even better than being Queen of one lousy planet!