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I'd love to see the first one put on Ranma and he he is forced to make a real decision on the fiance wars like if Happosai gets it on him and commands "Have sex with someone you know." And well ranma must have sex or die in 24hrs.
Yeah, he'd find a way out of that. For example: cue mirror clone or curse-splitting incense. That's someone he knows, after all!
I actually like the last two objects of that bunch best, although all four have possibilities.
To keep with the Ranma theme, consider if Nabiki or Kasumi got the Pendant and used it to alter everyone slowly and settle things. Ukyo and Ryoga *might* also use it slowly, as would Cologne. But just about everyone else would go crazy with it immediately…except for Akane and Ranma, who probably wouldn't use it intentionally at all.
But the Regret Reverser and Flaw Eater have quite a few possibilities. The Regret Reverser in particular could lead to a genuinely poignant story. I like that concept.