Akinator just uses a binary phylogeny tree similar to how you might identify plants of animals. So it asks a question “is your character male or female” then depending on the answer it can narrow the pool down by eliminating the impossibilities. As the pool gets smaller and smaller it can ask more specific questions, or it can ask a vague question that only has a few people in it remaining. For example the question “does your character wear glasses” is extremely broad. But since he has already asked “Is you character male, fictional, younger than 20, from a fantasy book, a wizard, parents killed by the Dark Lord” then it may have it narrowed down to only a few and the question “Does your character wear glasses?” Gives an answer.
Now when you successfully stump Akinator, it asks you to create a new question that it can use to differentiate between the answer and guess he got wrong. And by doing that it can find key words in that difference to categorize the character into another group to help narrow it down.
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