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so call me slow, but i finally figured out what overhaul's whole deal as i was watching a reaction video of MHA s4 and heres what i thought:
overhaul deemed all quirks as a disease that needs to be cured. why is that?
because the appearance of quirks and heroes brought the yakuza to ruins. and since quirks are biological mutation, its therefore a disease that almost eradicated their way of life! he wanted to erase quirks and give his boss the glory and stand tall in the underworld of criminals. i can finally sleep in peace. ty