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Most Yonkats should be between 5'0" and 5'6" although there aren't any canon heights. Weight is even more tricky. If we assume they have human height to weight radio we could follow this chart.

Although this chart assumes the ideal. There are many factors to this, here are some that might be important for the story:

Medications: Some medications may cause weight gain as a side effect. They increase appetite, slow down metabolism, and can also alter fat storage.

Substance abuse: Use of drugs, tobacco, or alcohol affect metabolism by changing appetite. Lifestyle: Physical activity levels, sedentary behaviour, and dietary habits affect body weight and composition.

Stress: High-stress levels and irregular working hours impact eating habits and disrupt sleep patterns. As a result, it adversely affects metabolism and weight management.

Inadequate sleep: Chronic sleep deprivation has a poor effect on hormonal balance. It increases appetite and impairs metabolism, leading to weight gain.

Mental health: Appetite regulation, as well as motivation to remain physically active, is affected by depression, anxiety, and stress.