As someone who spends an unhealthy amount of time dreaming up ways to kidnap super-heroines, I have to say without any reservations, there are two you should never, under any circumstances, abduct:
1. Susan Storm, aka Invisible Woman
2. Angela Spica, aka Engineer
If you're feeling lucky, or suicidal, you might get away with holding someone dear to them hostage, but actually trying to kidnap them...no. That's crazy talk.