Which ghosts would make great pcs?

[Shades of Eternity]

I created a Fate fugitive where a ghost or other spectre is turned into a semi-physical form and therefore a viable PC. They retain many of their ghostly characteristics, but are "freed" from their tale and given free will.

Which ghosts throughout various tales would you want to see turned into an adventurer and why?

 

[Tonguez]

The ghost of Sergei von Zarovich - a noble, devoted paladin with a radiant heart, he now has a chance to stop the cycle of corruption started by his brother