Quoted By:
After countless weeks of research we have come to the conclusion that Shellin potentially has the sharpest chin in all of Nijisanji, HOWEVER, due to it being blunted the title instead goes to Kuzuha as the man with the sharpest chin due to him having the sharpest chin angle at 91.46° (only second to that of Shellin at 84.59°) and also having an extremely sharp pointy end to his chin.
Thus I would like to revise my findings and conclude, once and for all, that Kuzuha, the KING himself, has the sharpest chin in all of Nijisanji JP and has a chin that could pierce the heavens.
Notable mentions:
Yumeoi Kakeru, visually has the sharpest chin in the picture (seriously just look at his model) and third sharpest chin angle at 91.75° only a tiny bit away from being objectively the man in Nijisanji with the sharpest chin. One could make a case for him too if you consider sharpness at the pointy end of the chin, but we'd be counting pixels at that rate, and Kuzuha's chin is quite sharp already.
Fushimi Gaku, quite the sharp chin, also Ago's boyfriend, having 93.72° chin angle.
Kenmochi Toya, aka the man, the myth, the legend, Ago himself, and the very host of Sharpness Radio! Coming in at 95.66°