....I tried posting earlier today, but the post was so long, I was logged out...XD
Got too excited making my first Katanagatari comment, I guess...
Spoiler made me go and hunt down the Chinese translation of the light novels, so now I'm partially spoiled on details...But I won't say them here, so no great worries...
Spoiler for Final ep spoiler from preview:
Reached for the tissue several times during just the last episode segment....At first I though Shichika went and bought brown coloured clothes that had Togame's pattern or something...and then I remembered...dry blood is brown...
I...I need more tissue!
And I guess the eye color change was from shock? Instead of his hair, his eyes took the blow instead?