[quote=Quatro]
In terms of a time limit, the powers would remain until the threat is no more. In the scenario where a tank falls on top of you and you'd develop super strength or toughened skin, I'd expect the abilities to last until you aren't under the tank and being crushed anymore. Any sooner and you'd probably be dead.

As for other limitations, I think having it only activate in the presence of an incoming threat and only being temporary is a pretty good weakness. When not faced with anything, my character would just be a normal person. 

Comparing this to the other abilities and weaknesses of characters that have already been accepted, I think this seems pretty fair. The abilities Diego copies seem like they're permanent while only having physical contact as a prerequisite as its weakness; not sure if I missed something though but that doesn't sound like that much of a weakness. Also, if I sound rude in anyway, that wasn't my intention. I just wanted to point it out as an example and this was the best I could find.
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You make a good point. I'm absolutely fine with people debating their intended powers as long as they present a good case; which you have.

The only real reason I mentioned the time limit was because it was something that could be improved upon over the course of the RP - that's really what the point of weaknesses are here so there's something for a character to work on, as it were.

And Diego's power is that he can only copy - he doesn't master the ability and can only remember a select few at any one time. That may not be clear in the CS but that's been the case in previous RPs with that character.

To sum up: I agree with your points; since the power is a reactive rather than proactive one it has enough built in weaknesses in and of itself. I might still suggest a maximum time limit on a power simply so there's something that can be worked on over the course of the RP but that's entirely up to you.