Getting all of the Stars of Destiny in Suikoden III results not in the typical alternate ending but only in a scenario in which you get to see events from the antagonists' point of view. This isn't just to be annoying: the last four Stars are the antagonists themselves, who never actually join the main characters. —Cat In Cyberspace
The reason why in the end of I, Soul Eater rejects Windy, it is not because simple Even Evil Has Standards. But more like how Soul Eater feeds, it fed on the souls of those close to the bearer. On the other hand, Windy has never accepted anyone in her heart, constantly only thinking of herself and her desire to destroy the world for self-revenge, she doesn't even open her heart to Barbarossa. Therefore, Soul Eater refuses to be hosted by Windy because it'll end up hungry with no 'close friend's soul' to consume.
In recruiting Oulan in II, you have to make an all-women party and then get accosted by ruffians that knock you down and they attempt to kidnap the women. This can occur anytime after you get your HQ. The question is, is there any reasons other than Gameplay and Story Segregation that these guys can overpower a party of ladies that have defeated frickin' Luca Blight? Forget Georg Prime, these ruffians are the true Memetic Badass of the Suikoden universe...