Not having played MGS...is Big Boss/The Boss a significant rivalry? Feel free to spoil it (but obviously put a spoiler warning for the sake of everyone else!) Of course, even if it's not, Big Boss is still strong. However, not exactly leagues about Tidus. And Jecht is about on par with The Boss. Maybe Tidus/Jecht isn't such a bad pick.
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"Ah, a party! We haven't had one of those. So...what is a party?"
"Well, you drink punch and eat CAKE! ...I think."