Characters that die:
Varre, wants you to serve Mohg, dies when he tries to fight you there for whatever reason
Boc, wants to be reborn, dies if you help him
D, not sure what he even wants, dies when Fia leaves
Guranq, wants deathroots, dies? technically this image/clone thing doesn't die even after you kill the real one, weird shit
Thops, wants to get into the academy, dies in there
Hyetta, wants grapes, dies once she's guided you to the Three Fingers
Alexander, searches for the greatest glory in combat, dies to the Tarnished in a duel
Blaidd, wants to serve Ranni, dies when Ranni obtains what she wants
Seluvis, wants to control Ranni, dies when Ranni obtain what she wants
Iji, wants to help Ranni, dies when he hears Blaidd died for serving Ranni
Fia, wants to birth Godwyn's child, dies to D's brother for having killed his brother
Sellen, wants to learn of primordial magic, "dies" when she learns primordial magic
Corrhyn, wants to understand Golden Mask, they both die when the tree burns
Yura, wants to kill the Bloody Fingers, dies to the last one
Bernhal, wants to do Tanith contracts maybe, not too sure, dies in Farum once he tries to kill you
Rya, wants to know the truth, either asks to be killed or leaves when she does(might be considered dead after leaving too I guess)
Black Bogart, not sure what he wants but still dies to Dung Eater(unless you kill Dung Eater first)
Dung Eater, wants to curse everything, dies after being fed all the curses("good" ending for him though)
Millicent, wants to discover her connection to Malenia, dies whether or not you decide to kill her once she reaches the truth
Latenna, I guess just dies right away, and you help her after that
Rogier, wants to know about the Black Knife stuff, dies regardless
Diallos, wants to pretend that "the tale of House Oslow is told in blood", big pussy, still dies anyway
Characters that don't die
Roderika, actually doesn't die, but also important mechanic NPC
Kenneth/Nepheli, actually don't die, good ending
Ranni, died already, but is still somewhat alive, doesn't die again
Gowry, wants to see Millicent "bloom", kinda doesn't die I guess, but drops a talisman on death if you kill him after
Tanith, wants us to join the family, doesn't die directly but can be killed for special rewards
Patches, wants to survive, actually survives