Princess and Knight, colored version nanora. The Knight protects the Princess no matter what, and the Princess's support heals the Knight nanora. #LunArt
Seems impractical. Like, getting the shield damaged might lower the morale of the holder and other Luknights for "damaging" the princess instead of enraging them. Unless the knight is the type like Marine who would want that sort of thing because of Luna being annoyingly cute.