give at least one quote that shows us what this character is like.

"If music be the food of love, play on;

Give me excess of it, that, surfeiting,

The appetite may sicken, and so die.

That strain again! it had a dying fall:

O, it came o'er my ear like the sweet sound,

That breathes upon a bank of violets,

Stealing and giving odour! Enough; no more:

'Tis not so sweet now as it was before."

This quote tells us that Orsino's character is passionate, self-centered, moody, and fickle.