I think before people die, we should do what happened to Artemis in Artemis Fowl
To the people that don't know what Foaly and Holly did in Artemis Fowl:
(in-depth)
[b][SPOILER][/b]
So, there was a battle between artemis and the berserkers. Lets just call them the enemys. Artemis had to sacrifice himself, to distract the berserkers to give his pixie friend, holly a chance to kill them. So, artemis had a plan to clone himself. He kissed holly, and when he kissed holly he said to tell Foaly about the kiss. He then sacrificed. Months later, Holly remembered to tell foaly about what happened. The saliva of the kiss was still on her. So, foaly has did some crazy-magic stuff to the saliva and was able to replicate Artemis since of all the DNA in saliva. Now, clones are stupid because they do not have a spirit. Assuming ghosts are real in the book, artemis was able to still stay in the physical word for all this time, as a ghost. Since this happened, artemis (the clone) was able to be not as stupid as all the over clones since he stayed with the physical world. Artemis does not have his memory although, the ending of the book ends up of Holly telling artemis from the first book to the last. I loved the ending.