[state_alchemist]

Well here's my thoughts(what's in the spoiler is only my speculation)

Spoiler:

well, I think that because Midori got into an accident is part of the reason why she is there. The reason being that her conciousness is to be there in her mini right hand form. And the other part of the reason why Midori is apart of his hand is because I think that she wished so hard for her to be by his side, that it came true. At least thats what I think.

Originally Posted by Marine-RX179

Na, the cat is just there to be ran over, stepped on, squished for viewer's pleasure lol.

And I agree w/ Marine, the neko is there for comedy relief. Kinda like how the neko for Trigun was.