Performer
A performer whose catalogue work here is strong, with the fuller case still to be made.
Nutevio rank
#1699
of 909177 performers
Top 1%
Kohei Amasaki works on drama rather than volume, and the catalogue keeps proving that the quieter choice was the correct one.
The essay
Our editors on the work, the patterns and the reason this body of work holds together.
Kohei Amasaki appears in 3 films in the Nutevio catalogue, and none of them would work the same way without Kohei. Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation is the clearest case: a film rated 8.0 by our editors, where the performance carries weight the script only implies.
The recognisable elements are drama, transformation, quiet performance. Watch two of these films back to back and the method separates from the material — the same instrument, tuned differently for war, science fiction, drama. It is a style built on what is withheld as much as what is played.
Working with Shukou Murase, Kyouhei Yamaguchi, Takuya Sato, Kohei Amasaki helped set a standard other performers now audition against. Awards bodies have been slower than the work, which is usually the sign of a career built on choices rather than campaigns.
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation (2023) as Exceedfighter (voice) · MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe (2026) as Fencer Mayne (voice) · Happy-Go-Lucky Days (2020) as Shin-chan's father (voice)
Career snapshot
Ranked #1699 of 909177 performers tracked in the Nutevio library.
Films in Nutevio
3
2020–2026
Career length
6 yrs
Measured across our catalogue
Academy Awards
—
Unknown
Oscar nominations
—
Unknown
Highest Nutevio score
8.0
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
Average Nutevio score
7.0
Across catalogue work
Highest IMDb rating
8.0
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
Most frequent director
Shukou Murase
1 film together
Longest collaboration
1×
With Shukou Murase
Most common genre
Science Fiction
2 titles
Average runtime
0h 56m
Across catalogue work
Golden Globe wins
—
Unknown
Nutevio metric
Ten weighted categories, applied identically to everyone we cover.
Nutevio Performer Score
6.8
out of 10
A performer whose catalogue work here is strong, with the fuller case still to be made.
Nutevio metric
Cultural impact and legacy, measured separately from craft — how far the work travelled once it left the cinema.
Nutevio Influence Score
6.4
out of 10
A quieter influence — felt inside the films rather than across the industry.
How far the work travelled past the people who saw it first.
What survives once the release-week conversation has burned off.
Institutional acknowledgement, weighted but never decisive.
Years of chosen, relevant work rather than years merely employed.
Statuettes, read as evidence rather than verdict.
Roles named without needing the film named alongside them.
Directors who wrote parts because this performer existed.
The reading other performers now have to answer.
Actor DNA
A fingerprint derived from the roles themselves — register, range and the kind of film they carry.
The shape of a career
Every performance plotted in time. Hover a point to read the title behind it.
Peak years
Where the scores, the awards and the sheer volume of work agree with each other.
Best decade
2020s
7.0 average MV
The 2020s are where the work and the material meet. MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe, Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation, Happy-Go-Lucky Days — the run our editors reach for first when the argument is about range rather than fame.
Highest average Nutevio score
2020s
7.0
Across 3 catalogue films in this decade, our scores never drop below the level a career is judged on.
Highest average IMDb rating
2020s
7.0
The public agrees most strongly about this stretch — useful context, and occasionally a decade behind our own reading.
Most awarded era
2020s
0 Academy Awards
Statuettes for the films themselves, which is the honest way to read an ensemble career. MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe, Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation, Happy-Go-Lucky Days.
Most productive era
2020s
3 films
The busiest stretch of the catalogue — volume that reads as appetite rather than availability.
Range, mapped
Genres down the side, decades across the top. Warmer cells mean stronger titles.
| Genre | 2020s |
|---|---|
| Drama | 6.52 films |
| Action | 8.01 film |
| Romance | 5.61 film |
Chronology
Firsts and peaks
The turning points, in the order they happened.
First film in Nutevio
Where our catalogue meets this career, as Shin-chan's father (voice).
Highest rated performance · Career peak
2023Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
8.0 on the Nutevio scale, the top of the catalogue for this performer. Weighing billing against the film's own quality, this is the point where everything aligned at once.
Most recent film
2026MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe
The current state of the argument, as Fencer Mayne (voice).
Our order
Every performance in the catalogue, ordered by Nutevio Score.
Every title
Filter by genre or decade, and compare any two titles side by side.
3 of 3 films
as Exceedfighter (voice)
Directed by Kyouhei Yamaguchi
as Fencer Mayne (voice)
Directed by Shukou Murase
as Shin-chan's father (voice)
Directed by Takuya Sato
From the library
Every movie and TV credit stored for this name in the Nutevio catalogue — filter by media, role or sort by rating.
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The defining work
#1
Exceedfighter (voice)
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation (2023)
Performance score7.8
The performance the rest of the career is read through. Exceedfighter (voice) gives Kohei Amasaki a structure to work against, and the film hands over its centre of gravity without hesitation.
View movie#2
Fencer Mayne (voice)
MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe (2026)
Performance score7.2
MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe asks for something the previous films did not, and gets it. Fencer Mayne (voice) is played without a single line of pleading for the audience's sympathy — which is exactly why it lands.
View movie#3
Shin-chan's father (voice)
Happy-Go-Lucky Days (2020)
Performance score6.5
Happy-Go-Lucky Days asks for something the previous films did not, and gets it. Shin-chan's father (voice) is played without a single line of pleading for the audience's sympathy — which is exactly why it lands.
View movieStart here
A guided path through the work, ordered so each film explains the next.
Best entry point
as Exceedfighter (voice)
Start here. Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation is the clearest statement of what Kohei Amasaki does — accessible, 0 minutes, and rated 8.0 by our editors. No context required.
Our editors order this path by accessibility first and chronology second. You meet Kohei at the most legible performance, then move forward in time so each film reads as a response to the one before it rather than a repetition of it.
Happy-Go-Lucky Days (2020)
A deliberate change of key after Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation — same instrument, unfamiliar tuning, and the reason range gets mentioned.
MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe (2026)
Keeps the drama register of Happy-Go-Lucky Days but asks for a colder reading of it.
Company kept
The directors and performers this career keeps returning to.
Takuya Sato
Director
1 film together
Notably Happy-Go-Lucky Days
Kyouhei Yamaguchi
Director
1 film together
Notably Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
Shukou Murase
Director
1 film together
Notably MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe
Behind the camera
Who casts this performer, how often, and what the pairing produces.
Kyouhei Yamaguchi
Director
1 film together · 8.0 avg MV
One film, but the kind that reorganises how a performer is cast afterwards.
Shukou Murase
Director
1 film together · 7.4 avg MV
One film, but the kind that reorganises how a performer is cast afterwards.
Best film together
MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph CirceTakuya Sato
Director
1 film together · 5.6 avg MV
One film, but the kind that reorganises how a performer is cast afterwards.
Best film together
Happy-Go-Lucky DaysSix degrees
Follow the thread outward — director, film, co-star, and the film after that.
Categories of our own
Six editorial categories we apply to every performer we cover.
Most rewatchable
MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe
as Fencer Mayne (voice)
The one that survives a fourth viewing. Nothing in the performance depends on surprise, which is why it keeps paying out.
Most emotional performance
Happy-Go-Lucky Days
as Shin-chan's father (voice)
Grief played at conversational volume. The film never asks the audience to cry; the performance simply makes it difficult not to.
Most influential performance
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
You can hear this reading in other actors' auditions a decade later — the surest measure of influence there is.
Best ensemble performance
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
Work that makes everyone else in the frame better without ever pulling the camera towards itself.
Career defining performance
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
If the career had to be argued in a single scene, our editors would pick one from this film and rest the case.
In their films' words
“You can build a whole film around a performer who knows when not to speak. Kohei Amasaki has known it for a long time.”
Head to head
Put two careers on the same scale and see where the argument actually sits.
Ours alone
Recognitions handed out by this desk, on criteria no awards body uses.
Modern Classic Performer
Awarded
Defining performances delivered inside the last twenty-five years, in films already being taught rather than merely remembered.
Science Fiction Legend
Awarded
2 catalogue titles in science fiction, each one a reference point for the films that followed.
Our desk
Best ending, best opening, best twist and the rest — categories we apply to everyone we cover.
Best ending
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
The last five minutes reorganise everything before them, and hold up when you already know what's coming.
Best opening
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
A first sequence that states the rules of the film without explaining a single one of them.
Most emotional
Happy-Go-Lucky Days
as Shin-chan's father (voice)
The film where the technique steps aside and lets the feeling arrive undefended.
Best twist
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
A reversal earned by information the film gave you and trusted you to misread.
Best visual achievement
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
Images that would survive with the sound switched off.
Best action sequence
Kamen Rider THE WINTER MOVIE: Gotchard & Geats Strongest Chemy★Great Gotcha Operation
as Exceedfighter (voice)
Geography, stakes and consequence held in the same frame — spectacle you can follow.
Best dialogue
MOBILE SUIT GUNDAM HATHAWAY The Sorcery of Nymph Circe
as Fencer Mayne (voice)
Lines written to be spoken, staged so the pauses do half the work.
Most underrated film
Happy-Go-Lucky Days
as Shin-chan's father (voice)
The public vote sits below ours on this one, and the direction is the reason for the gap.
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Reference
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