Yoshimitsu appears in both Soul Calibur and Tekken but has different backstories and designs. In Soul Calibur, he is a medieval ninja leader with a cursed sword, while in Tekken, he is a futuristic, cybernetic ninja. Despite sharing a name, they are distinct characters tailored to their respective series.
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https://www.youtube.com/watch?v=1KGtsmpJ3Lk