Inspired by: this question
Of course, murdering someone is forbidden and mutilating a body is forbidden. But setting these issues aside, would human flesh be halal for eating?
If eating human flesh wasn't haraam, it would not have been compared to backbiting.
O you who have believed, avoid much [negative] assumption. Indeed, some assumption is sin. And do not spy or backbite each other. Would one of you like to eat the flesh of his brother when dead? You would detest it. And fear Allah ; indeed, Allah is Accepting of repentance and Merciful.
When Backbiting is haraam, ....
Woe to every slanderer and backbiter.
... so does eating human flesh.
Consuming the flesh of animals that eat other animals is strictly forbidden. Since humans eat meat it would not be suitable for eating, as it is haram. However, if a human were to eat only vegetables, then they would be halal to eat because it would be the same as eating a sheep or a cow.
I hope you find this information useful and good luck with your pursuit of Islamic Enlightenment!