Although not deceased, a boy woke up one morning to become a Kadabra. So... yeah. xD
It can swallow anything of any size, and the swallowed thing will never be seen again.
If Haunter licks a person, that person will shake violently, which ends in death.
If Honedge's blade is touched, Honedge's blue cloth will wrap around the 'toucher' and will suck the life force completely out of him/her.
Phantump are the spirits of children who once died in the forest.
When Yveltal dies, all living things in the world will die as well.
Those are just a few. If you have any more, feel free to add. :3
Hope I helped. :)