You're the douchbag who killed Katara and Sokka's mom. other then that you barely appear in the show. But since you left a permanent impression with your killing, You are the Serial Killer every night you can pm me the name of someone and they will die.
Since Katara showed you mercy i'll give you a extra perk, you are 2 shot bp.
Chisto was praticing some swordplay when all of a sudden his muscles seized up and he died.
Spoiler for christo:
Congratulations, you are
Suki Avatar Aligned
You are the oldest member of the Kyoshi Warriors. You also happen to be the one Sokka falls in love with and presumably spends the rest of his life with. Because you are really good with a sword, this makes you the VIG. Each Night you can pm the name of a player and they will die.
You win when all threats to the Avatar are eliminated.