i was actually going to reply saying that there isn't a colon and that anyone who says there is is wrong. then i looked at the amiibo website, and it's listen without a colon on the lucina amiibo but with a colon on robin.
i'm 99% sure that there is officially not a colon, although there really should be one, which is why everyone, even nintendo gets confused and assumes there is. i think it should be there too but still, seeing it written wrong just really bothers me idk