Ace - One Piece
Teresa - Claymore
Gaara / Kakashi - Naruto (they come back to life though)
Vegeta - (also comes back to life...)
Kaworu - Neon Genesis: Evangelion
Well lets see, Riku (Blood +), Jiraiya and Itachi (Naruto Shippuden), Madame Red (Black Butler), Ace and Whitebeard (One Piece), Ulquiorra and Stark/Lilynette (Bleach)
Well, I sure as hell miss Wolfwood, but I wouldn't say he was "killed". In the manga he died from a drug overdose, and while in the anime he was shot, he sort of hid the wound from everyone and slowly died from loss of blood while reflecting on his life, wouldn't exactly call that "being killed".
~ (First World) Yuno from Mirai Nikki
~ (kinda...) Sekai from School Days
~ Jakotsu, Bankotsu, Kagura and Kanna from Inuyasha
~ Ciel Phantomhive from Black Butler (even tho he was a little douche... i still love him)
~ L from Death Note
~ Itachi Uchiha, Sasori, and Jiraiya from Naruto
~ Nagisa and Ushio Furukawa (The first time) from Clannad (The After Story)
~ Lelouch Lamperouge from Code Geass
~ Misuzu Kamio from AIR
~ Hughes from Full Metal Alchemist
~ Ulquiorra from Bleach
Ace - One Piece
Teresa - Claymore
Gaara / Kakashi - Naruto (they come back to life though)
Vegeta - (also comes back to life...)
Kaworu - Neon Genesis: Evangelion
what chapter did kakashi die in?
Not sure exactly but it's when Naruto is fighting Pain.