Hugh is a level 15 unpromoted mage when he joins, yet has growths near the levels of a prepromote. Why is this? Because he's just not that mature! He's a grown man who still acts like a child, so if he was more mature, then he would've already been promoted.
Plus, Hugh may have inherited his mother's huge skill for Anima Magic... but was raised by his grandmother, who is a Druid aka specialized in Dark Magic instead. Niime simply can't draw out Hugh's whole potential no matter what, his magic skills lie elsewhere.
Why is Eliwood so powerful in the Trial Maps? Because he's not ill anymore! Or at the very least that's what his Trial Map incarnation is going for.
If Ninian is Roys mother, then Roys belief that humans and dragons can live in peace takes on a whole new meaning, as Roy himself is proof of this.
What if Roy is a quarter dragon manakete. If Ninian is his mother, this is the reality. He can't transform because he doesn't have a dragon stone. Also, if he is quarter dragon he will outlive everyone but Fae and Sophia.
On the other hand, Sophia is never shown with a dragonstone, either, implying that some manaketes are okay with not transforming. Additionally, her and Fae's supports imply that part-manaketes don't live quite as long as full dragons do, softening the potential problem with Roy slightly.
If Ninian is his mother, it also presents one other piece of fridge horror: Roy is going around killing other dragons possibly without knowing he himself is part dragon, making him an unwitting Hunter of His Own Kind.
Although it is also hilarious, Sue could be Rath's and Lyndis' daughter. Roy could be Eliwood's and Lyndis' son. Roy and Sue can be an item, which implies that it's possible that the relationship is incestuous, despite Sue and Roy both being the children of Lyn being pretty much impossible... unless she cheated...
Lyn is also potentially Lilina's mother, meaning that would have to be some pretty serious cheating for any of Roy's love interests to be his half-sister. Much more plausible, however, is him and Lilina potentially being cousins (by way of Eliwood/Fiora and either Hector/Farina or Hector/Florina).
Or (and the most likely option, given that all three of them are around the same age, which would make it pretty difficult for Lyn to birth all three of them) Lyn did not cheat on her spouse.
Hector's death in The Binding Blade is a Player Punch already for those coming in from The Blazing Blade, but remember that he almost certainly had his most loyal retainers with him in that battle. That's right: Oswin, Matthew, and Serra were most likely killed off-screentrying to protect Hector, and their sacrifice still wasn't enough.note (No matter their canonicity or lack thereof, the novels apparently state that Oswin did die in the same battle that took Hector's life...)
Juno's support with Noah reveals that her old rival was Sigune, the Flightleader at the time of Roy's invasion of Ilia. This means that you unwittingly killed one of Juno's closest allies.