I have noticed that in some games the sprites for certain characters are in the rom multiple times. I.E.
Simon's Quest, Zelda II, Ninja Gaiden all have the main character frames: Simon, Link and Ryu in the ROMs image at
multiple locations using space unnecessarily.
But in games:
Castlevania I and III, Ninja Gaiden II and III, Megaman and even in the dreadful Dr. Jeckyll and Mr. Hyde
you only find the playable character animations once.
I find that confusing. Some of these games are linear platforms and others are adventure games but all things
being equal I don't understand the reason why they are set up like that.