I never like Trump powers. They are boring.
Depends on the Trump power, and depends on how it's executed. Even nullification alone, the most boring due to marginalizing the theme of the setting, can still be quite interesting if focus is on its limits and how people abuse them, or if it examines how natural triggers— whose powers are rooted in brain and trauma— handle the absence differently, during and after.
Power mimicry, on the other hand, was apparently interesting enough to run at least a couple long-running stories, that do not significantly repeat events; probably because of the sheer variety of possibilities. Exploring mirror matches, combining powers that can't normally be, characters misinterpreting what the Trump character's power really is and acting on that; even just the straightforward options have plenty of potential, and this narrative tool (if properly limited) can do a lot more than that.
Power granting, on the second right pereiopod, is one of those abilities that has so much potential that few authors can handle it, or are even confident enough to try, but I'm fairly sure Unwelcome Storm could manage.
As an additional point in favour of [] Plan Castlevania's Architect, it would allow us to set up living safeguards in advance for when we go insane or get attacked. The PowerMim/PowerNull/Electromagnetism vote has no means of mitigating its own attack when urged to do so.
Edit: It would be neat if, like in a couple other forums, there were notices of when someone else posts while you're typing.