People who have died:

Android #16 - Head is crushed by Cell

Android #17 [1] - When Cell self-destructs - Killed in the future timeline by Trunks

Android #18 [1] - Killed in the future timeline by Trunks

Android #19 - Blasted by Vegeta's Big Bang Attack - Killed by Trunks in GT

Android #20 (Dr. Gero) [1] - His head is stomped by #17 - Skull is crushed again in the Trunks timeline - Killed by Super #17 under Dr. Miyu's control

Apple - Killed by Vegeta

Baata - When his neck is snapped by Vegeta's knee

Babidi [1] - Head blown off by Fat Buu

Bardock [Several thousand] - When Furiza pummels planet Vegeta with a massive energy attack

Bebi [1] - Destroyed by SSJ4 Goku

Bibidi - Killed by the East Kaioshin

Black Sousei [1] - Killed by Goku and Android #8

Blue Shogun - Killed by Tao Pie-Pie (with his tongue o_O)

Bora - Killed by Tao Pie-Pie

Boss Rabbit - Killed when Kame-sennin blows up the moon

Bubbles - When Cell self-destructs on Kaio's planetoid

Buruma - Turned into chocolate and eaten by Super Buu

Cell [Millions] - Vaporized by Gohan's Kame Hame Ha - When Trunks returns to the future

Cell Jr.'s - Pulverized by SSJ2 Gohan

Chaozu - Blown away by Piccolo Daimao - When he self-destructs in an attempt to kill Nappa - When Kid Buu blew up the Earth - In Future Trunks' timeline, he was killed by the Androids

Chi-Chi - Turned into an egg by Super Buu, then smashed

Cymbal - Sliced by Yajirobe

Dabura [1] - Turned into a cookie by Fat Buu

Dende - Killed by Furiza

Dodoria [Dozens] - Melted by Vegeta's attack

Drum - Decapitated by Goku

Everyone NOT on Kami's Look-out during the Buu saga - When Super Buu used his genocide attack

Furiza [Millions] - Sliced and diced by Trunks, then powderized - Killed by Goku in Mirai Trunks' timline

Garlic - Destroyed by Kami-sama

Gerudo - Decapitated by Vegeta

Giran - Killed by Tambourine

Gohan [12] - When Kid Buu blew up the Earth - In Mirai Trunks' timeline, he was killed by the Androids

Gohan (Goku's foster grandfather) - Stepped on by Oozaru Goku

Goku[100+] - Sacrificed his life to save the world from Raditsu (Piccolo killed him) - Sacrificed his life again by teleporting with Cell when he was about to blow up - In the Future Trunks timeline he died of a heart disease

Goten - When Kid Buu blew up the Earth

Great Elder - Dies of stress on Namek - Dies of natural causes on Earth

Gregory - When Cell self-destructs on Kaio's planetoid

Gyuu Mao [Dozens] - Eaten by Super Buu after being turned into chocolate

Jisu - Vaporized by Vegeta

Kami-sama [1] - Dies when Nappa fries Piccolo - Vanishes when Piccolo dies in the Trunks' timeline

Kame-Sennin [3] - Died trying the Mafuba attack on Piccolo Daimao - Eaten by Super Buu after being turned into chocolate

Kargo - Killed by Dodoria

Karin - When Kid Buu blew up the Earth

Kibit - Beheaded by Dabura

Kid Buu [Billions] - Vaporized by Goku's Genki-dama

King Cold - Blasted by Trunks - Killed by Goku in Mirai Trunks' timline Kuwi - When Vegeta puffs him up like a balloon and explodes him

Dr. Miyu - Skull crushed by Bebi - Destroyed by Super #17

Mustard - Killed by Gohan

Namu - Killed by Tambourine

Nappa [Several thousand] - Killed by Vegeta - Killed by Vegeta AGAIN in GT

North Kaio - When Cell self-destructs on Kaio's planetoid

Oolong - Eaten by Super Buu after being turned into chocolate

Panbuukin - Killed by Dodoria

Piano - When his neck is broken by Piccolo falling on him

Piccolo [2] - When protecting Gohan from being killed by Nappa - When Buu blew up the Earth - When the Earth explodes in DBGT and he refuses to leave the Earth that he loves so much - In Future Trunks' timeline, he was killed by the Androids

Piccolo Daimao [Several thousand] - When Goku rips through his chest with a flying headbutt

Mr. Popo - Eaten by Buu

Puar - Eaten by Super Buu after being turned into chocolate

Pui Pui [1] - Killed by Vegeta

Raditsu [Hundreds] - Skewered by Piccolo's Makankosappo

Red Ribbon Army - Wiped out by Goku

Red Sousei - Shot in the head by the Black Sousei

Rikum - When he is blasted by Vegeta

Rou Dai Kaioshin - When he offers his life to Son Goku

Salt - Killed by Gohan

Shen-lon - Killed by Piccolo Daimao

Seripa - Killed by Dodoria

Spice - Killed by Gohan

Super #17 [1] - Destroyed by Goku and Android #18

Supopovitch - Blown up by Babidi

Tambourine [3] - Killed by Goku

Tao Pie-Pie [2] - When his own grenade is kicked back to him

Tenshinhan [1] - Killed himself with a Kikouhou when trying to destroy Nappa - When Buu blew up the Earth - In Future Trunks' timeline, he was killed by the Androids

Tomar - Killed by Dodoria

Toteppo - Killed by Dodoria

Trunks [15+] - When Cell blows a hole in his chest - Killed in Cell timeline - When Buu blew up the Earth

Ubuu - Accidentally turns himself into chocolate, eaten by Bebi

Vegeta

Vegeta [Hundreds of thousands] - When Furiza kills him on Namek - When he sacrifices his life to destroy Buu - In Future Trunks' timeline, he was killed by Android 17

Vegeta Ou - Assasinated by Furiza

Videl - Turned into chocolate and eaten by Super Buu

Villains of the movies - All killed in various ways Yajirobe [1] - When Kid Buu blew up the Earth - In Future Trunks' timeline, he was killed by the Androids

Yakon - Overwhelmed by Goku's Ki

Yamcha - When a Saibaman self-destructs - Turned into chocolate and eaten by Super Buu - In Future Trunks' timeline, he was killed by the Androids

Yamuu - Killed by Pui-Pui

Zarbon [Dozens] - When Vegeta digs his arm into Zarbon's abdomen and fires a blast

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Characters Who Have never Died:

All who were born after the Buu saga - There was no mass-genocide after the Buu saga, thus few people died after that time period.

Enma-daiou - Gateskeeper and judge of the dead, he was never involved in any of the fights, nor was he close enough to any of the battles to get hurt. The only question is--can we truly consider this guy "alive"?

Fat Buu [Billions] - He was absorbed by Super Buu and kicked around a bit by Kid Buu, but never has died (He does explode when protecting Ubuu from Bebi Vegeta, but he's not technically "dead").

Garlic Jr. - Granted immortality from the Dragon balls, he never dies (Although he is trapped twice within his own Dead Zone).

Mr. Satan and Bee - Surprisingly, this arrogant (but lucky) fool survived through many amazingly powerful opponents. He nearly died when he was shot once (along with his dog), but was healed by Buu just in time.

All the Kaios (except North) - Nowhere near Cell's suicide blast, none of the other Kaios have ever been in much danger

Urunai Baba - Fortune teller, also Kame-sennin's older sister. She can travel safely between Earth (the living universe) and the gates to heaven & hell (the spirits realm). Apparently, she was in the spirits realm during dangerous times, as we see that when she brings Vegeta back for one day, she doesn't have a halo (a sign that one is dead).

East Kaioshin [1] - The only Kaioshin who survived an encounter with

Majin Buu, he just got lucky. He also nearly died once, but was found and healed Kibit.