Copycat Ken
Ken's whole thing is mimicry—he can perfectly duplicate anyone's appearance from a photograph, and he picks up martial arts techniques just by watching someone fight once. It's a pretty solid ability in theory, but it turns out there's a major flaw: if you force him to shift between forms too rapidly, he gets disoriented and loses his edge. Ranma figured this out and basically overwhelmed him by making him cycle through different copies so fast that Ken couldn't keep up mentally. Once Ken's confused and scrambling, he's actually pretty vulnerable.
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