The "little blobby thing" is an onigiri. I'm not certain whether or not that qualifies as sushi; perhaps someone more versed in that sort of thing can help me out.

Remember how each character (with the notable exception of Akito) has a symbol associated with them? Kyou is the cat, Yuki is the mouse, and so on. The onigiri is Tohru (remember the game she used to play in second grade?)