Character · Death Note
Light Yagami's IQ — what the methodology actually says.
"Light Yagami's IQ" is a popular search. TV Intelligentsia doesn't invent IQ numbers for fictional characters. Here's the honest answer — the show's IQ Score, and what it tells you about how seriously the work treats his mind.
The honest answer
TVI scores shows and films, not characters. Assigning an IQ to a fictional character would be fabrication — we don't have a methodology for that. What we do have: a 0–200 rating of the work's structural intellectual quality, and that score tells you something real about how seriously Death Note treats Light Yagami's mind.
Who Light Yagami is, and what kind of intelligence the show actually depicts
Light Yagami (Mamoru Miyano (Japanese), Brad Swaile (English)) is high-school prodigy who finds a notebook that kills anyone whose name is written in it — the anime's central thought experiment about whether superintelligence applied to moral reform produces utopia or genocide. The character's intellectual signature in the show is tactical-deductive intelligence operating against an equally-matched detective opponent, intelligence-as-moral-corruption, the rare anime protagonist whose cognition is the actual structural antagonist of the story.
This is the part of the question "what is Light Yagami's IQ" that the search engine flattens. The real question — the one viewers are circling — is whether the show treats his mind seriously. That's the question TVI can actually answer.
What the IQ Score reveals about the portrayal
Death Note scores 147/200 (Stimulating tier) and Light Yagami is the rubric's strongest reading of the show's cognitive demand. The Light-vs-L chess match is sustained inquiry into what happens when superintelligence is applied without moral correction — the anime takes its own thought experiment seriously enough to render the protagonist's transformation into a villain without flattening either pole. The IQ Score reflects the structural commitment to actual deductive sequences (not just genre flourish).
For the full score breakdown — Cognitive Stimulation, Educational Value, Craft & Quality, and the rationale — see Death Note on TV Intelligentsia. Or read what an IQ Score is and how it's calculated.
Read the full methodology
How TV Intelligentsia scores intellectual quality — the rubric, the dimensions, the published framework.
Methodology →