Tales of Tasia (updated)
Arkimedes for Twilight
A ghost who's been around for centuries. Mortals can go to him if they need a favour, but he always expects payment in some way. He's usually quite calm and collected, but becomes a total nightmare if he gets angry or thinks he's being ripped off. Audio effects and distortion would be a bonus when performing angry lines.
*cool and calm* "Yeah, I get it. I'd be upset, too. But can you do me a favour? I promise it's nothing hard." *suddenly furious* "YOU'RE SITTING ON MY TOMBSTONE! GET OFF!"
"You see, when you've been around as long as I have, you learn to let the little things go. What's my real name? Did I have a family? I don't know. But guess what? I learned to let it go."
"... You think this is funny?" *slowly getting more and more angry* "If you don't pay me by tonight, I will possess your puny little body and THROW YOU OFF A CLIFF!" *compose yourself* "I don't bluff, kid. Just get me what I need, and everyone will be happy."