ahh what can I say...no I'm not gonna say anything...let the author and Ichigo themselves speak:
"After being pierced 의해 Rukia’s sword, Ichigo regains his shinigami powers once more. Just like the first time they met, they understood each other. Indeed, Ichigo’s and Rukia’s hearts connect." ―Tite Kubo (Bleach mangaka)
"I wonder if I would be able to keep up with the speed of the world without 당신 in it" ―Ichigo Kurosaki (manga poem to Rukia)
Just to be safe, I'll post my third OTP :) I don't usually mention it, but it's Suzaku and Lelouch from Code Geass. I think they make up for each other's down sides ^^ I also like them as friends. They're wonderful characters, IMHO.