I love quantifying these kinds of things.
Relationship meme a la .hack//G.U. style. Inspired by
harukami playing the game incessantly, and by
toppedbyzaworld's meme. Comment here, listing your characters, and which of my characters they know. I'll reply with an affection~ meter~ to let you know what how they feel about you.
In terms of progression, it goes red --> blue --> yellow --> pink, with 1-5 dots signifying how close you are to moving to the next level. The base colour varies depending on the character.
Fujisaki, Joshua, Kizna, Miyako, gooo!!