The loli will eventually grow up and become unattractive, but for a little while it'd be awesome.
C.C. on the other hand has looked the same for who knows how long, but she seems to have a thing for discarding humans when she no longer feels loved. Betrayal is immanent.
The other two are beyond consideration. Kallen's only worth a fling and Shirley's an amnesiac, which is certain to cause problems later on.