Can't say I'm familiar with Utau or her series, or Full Moon o Sagashite, but I do know and love Fullmetal Alchemist and Madoka! I'll be happy to have Vriska interact with Utau, too. Old CR influencing things is one of the interesting points of apping after someone's played the character before.

Thank you, by the way! I just grabbed some words and jammed them together, and bam, username.