5 months ago:
I feel Ichigo and Rukia are soul mates.
It's the chemistry I noticed between them since the very first moment they interacted. They started out with this cliché love-hate relationship, but during the story development, they turned out into something special and indescribable. Even now, eleven years after the first manga chapter was released, we are still not able to describe their relationship in one word.
People may not understand what we see in their bond, some may say they are almost like siblings, but the truth is that we've seen how Ichigo acts with his sisters and how Rukia acts with her brother and definitely there's nothing alike.
Between Ichigo and Rukia, there's this air of mystery who tends to be romantic but just stops when it's gonna get cleared. The line between friendship and love is almost undetectable when it comes to these two.
In a nutshell, I consider Ichigo and Rukia are made for each other because they both were and are able to give the other what they nedeed, to fill the other's emptiness (this is even said in poems 00a and 00b). For Rukia, Ichigo fixed her broken relationships with Renji and Byakuya, he also helped her understand that she indeed had a place in life and that she was worth saving. For Ichigo, there has been no other woman able to take him out of his depression or to stop the painful rain from his heart neither to be his ray of light. Most of these statements (said by Kubo or Ichigo) find their meaning when Kubo decided to put it clear by naming a novel: The Death (Rukia) save the Strawberry (Ichigo).