| Characters | Heights | Ages | Weights |
| Nagi Umino | ~5 ft 7 in | 16 years old | ~146 lbs |
| Erika Amano | ~5 ft 5 in | 16 years old | ~128 lbs |
| Sachi Umino | ~5 ft 3 in | 15 years old | ~124 lbs |
EXPLANATION OF A COUPLE OF CUCKOOS MAIN CHARACTERS’ HEIGHTS
We estimated Nagi’s height first then used this as a basis to approximate the heights of the other characters.
Since Nagi is 16 years old, we estimated that he is 5 feet and 7 inches in height.
To support this, the Hatena Blog revealed that the average height of a 16-year-old boy is 5 feet and 7 inches.
With that, we estimated Erika and Sachi’s heights based on how tall they were when placed beside Nagi.
In chapter 24, it is shown that Erika is only a few inches shorter than Nagi.
On the other hand, Sachi is half a head shorter than him.
EXPLANATION OF A COUPLE OF CUCKOOS MAIN CHARACTERS’ AGES
The manga revealed all the characters’ ages.
Most of them are teenagers.
EXPLANATION OF A COUPLE OF CUCKOOS MAIN CHARACTERS’ WEIGHTS
As for the main characters’ weights, we determined them through the Ideal Weight Calculator website using their heights and ages.
With Nagi’s heights of 5 feet and 7 inches, alongside his age, his weight is around 146 lbs.
Next, based on our calculation, Erika’s weight could be 128 lbs.
Lastly, Sachi’s weight could be about 124 lbs.
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References:
https://www.mrinitialman.com/OddsEnds/Sizes/compsizes.xhtml
https://nbakki.hatenablog.com/entry/Kids_Average_Height_and_Weight_by_Age_in_Japan
http://www.idealweightcalculator.org/
https://myanimelist.net/anime/48675/Kakkou_no_Iinazuke
https://myanimelist.net/anime/48675/Kakkou_no_Iinazuke/pics
https://myanimelist.net/anime/48675/Kakkou_no_Iinazuke/characters
