Here's how 'Game of Thrones' characters have changed over time, according to IBM's Watson

"Game of Thrones" characters go through some interesting changes as their situations alter over time.

We decided to take a stab at tracing these personality changes with IBM Watson, which has already aided Tech Insider in analyzing the "Harry Potter,""Star Wars," and "Lord of the Rings" universes. Watson has 30 APIs with 7,000 different applications that have been used to do everything from create a dating app to classify images.

For this assessment, we used Watson's Personality Insights and Tone Analyzer, which assesses traits based on the popular Big Five test that rates subjects for extroversion, agreeableness, conscientiousness, neuroticism, and openness to experience. It can also identify different tones such as fear, joy, confidence, and openness.

Here's what IBM researcher Vinith Misra found when using Watson to assess personality changes in the "Game of Thrones" books.

Daenerys loses her openness and liberalism overtime and becomes more angry, assertive, and dutiful. She also exhibits more neuroticism as time passes.

"With Dany, you see what people claim. Her openness, adventurousness, liberalness, and sympathy go down," Misra told Tech Insider. "What's growing is this assertiveness, proneness to worrying, anger, and sense of duty."

"She's become basically more of a ruler but a one with some worrying trends long term," Misra said. 

Sansa's initial extroversion and cheerfulness is increasingly replaced by dutifulness.

"Sansa has a sad progression — she went from being extroverted, cheerful, and having artistic interest to being more self-conscious and letting go of her imagination," Misra said.

Watson also found Sansa to become more dutiful, but that could be from her using the alias of Alayne Stone — a more job-oriented character.

Tyrion's initially more trusting and disciplined persona gives way to vulnerability and emotional alcoholism.

Tyrion certainly loses his self-discipline and sense of duty to become a more hardened and angry character. Killing Tywin is certainly proof of that transition.