So I know that villager is exclusive to mozu and her child, but I recently had an idea (that I can't test at the moment) for getting aptitude on Corrin.
It goes something like this:
1. Make Corrin's talent fighter
2. Marry Mozu to Keaton
3. Marry Velouria to Corrin
4. Partner seal Corrin to Villager (maybe?)
The logic is as follows:
Mozu passes down villager and its tree to Velouria, and Keaton passes down fighter and its tree as well. Corrin marries Velouria and gets access to the partner seal. He can't go into Wolfskin, and he already has fighter as a talent, so he gets villager.
The only thing I can think of being an issue here is the so-called tertiary classes. I read on the wiki about them concerning partner sealing Keaton and Charlotte, but I don't know if Velouria has one or if she does have one, does it appear instead of villager? Can someone with access to a powersaves device test this for me? I reeeealy don't want to go through the entire game just to try this one idea lol. I have seen a lot of aptitude (cheated of course) online, and I was just thinking of possible ways to get it onto other people.