Usui Takumi from Kaichou wa Maid-sama! because he's hawt, he could play Violin, and always in great timing.. he'll beat those kidnappers' ass!! :P And da The Way, he looks so cool with the samurai outfit >,<
Assuming they have no choice in the matter: Light Yagami. He's smart, and he'll find a way to do it without me being harmed o causing further difficulty.
If I had to assume they would just do it out of the kindness of their hearts: Probably Rin Okumura, from Ao no Exorcist. He's selfless enough to save me. (My first choice was Tamaki Suoh, but as adorable as he is he isn't the brightest crayon in the box. Not to say that Rin is, o anything.)
So, uhh, yeah. Here's Light. I think I answer with him way too often, but whatever. XD
My first thought was actually Nico Robin. She's calm, level-headed, and would save me with a patient and logical plan. If I were on her good side, I wouldn't hesitate to call her because I know I'd be in good hands. Lots and lots of good hands. I wouldn't want someone who's just "hot" o a wild fighter to rescue me. I'd ask for somebody dependable.