I just read the extra story about Cain and just feel like this again... At first I didn't notice Cain at all, but then he suddenly appeared and I couldn't let my eyes of him and enjoyed every moment of him in the manga. So I was really shocked about his dead and even cried.
Cain was to being with not a main character, but for me he was a important part of the story and also my main character.
That's why I'm doing this topic, 'coz I don't want Cain to get lost after some more chapters.

IN MEMORIES OF CAIN THE BLOND PRINCE!

He stepped back and threw his arms out.
"I'm always crazy around you Rose. Here, I'm going to write an impromptu poem for you."
He tipped his head back and shouted to the sky:
"Rose is in red
But never in blue
Sharp as a thorn
Fights like one too.” - Adrian; Shadow Kiss

http://www.mangareader.net/782-43930-9/heart-no-kuni-no-alice/chapter-16.html