I suggested either Ophanimon or AncientKazemon, since even though they are an angel and a goddess respectively they both look kind of knightly, but still trying to see if there are any other possible options.  Of course, she wants the whole line to be cute girls so that makes things a little more tricky but hopefully we'll work something out. ^^;

In the meantime, I think I've decided upon Botamon > Koromon > ToyAgumon > Reptiledramon > Grademon > VictoryGreymon, so yay~