I know this is a really old deviation, but according to the Lion King storybooks, which are often considered as part of the canon, Nala's father was an unknown rogue male that wasn't a part of the pride and didn't stick around.Disney seems to go to great lengths to explain away what would end up being incest. After all, they could've made Kovu actually be Scar's son in the second movie, but that would've meant he'd be cousin to his lover's father, so they were just like "Oh no, he's not really Scar's son (but he is Zira's, so Zira cheated on Scar despite being absolutely obsessed with him?) but Scar picked him as a successor anyway, at some point before being eaten by hyenas even though you never see any other males in the pride and Kovu is Kiara's age!"Disney...