Explain!

Why Miyabi has asperger?
Why Soukaku learning impaired?
Why Harumasa terminally ill?
Why Corin crippling social anxiety?
Why Ellen narcoleptic?
Why Lycaon a cyclops and missing his legs?
Why Vivian mentally ill?
Why Ben missing an eye?
Why is Koleda also missing an eye?
Why Lighter's eye sight bad?
Why Caesar missing an arm?
Why Piper old?
Why Nicole poor?
Why Yuzuha deaf?
Why Alice autistic?
Why S11's memory bad?
Why Trigger blind?
Why Fufu a systematic genocide survivor?

At least we got some fucking GAINS from the chinkwank kun fu training.