Hidden Talent. They suck at this but teach it enough and they become really good at it. Other weaknesses always stay weaknesses, but hidden talents can become good.>recruit characters
like 90% of the characters can be recruited. Talk to them and there will be an option to recruit. You either need a B rank or higher support level to recruit them, or you need to fulfill their unique requirements. Adults just require you to be level 15 or so. The kids usually have a specific skill or stat they want you to have at a high level.>route length
Edelgard's route is 18 chapters, all the others are 22 chapters. Edelgard has more side content/paralogues however, so it balances out.
Edelgard's route splits into two different paths, Edelgard or the Church. Many routes share missions or maps, even though the context and story around it may be different. Edelgard's has the most unique stuff despite being a shorter route, and Church route has the most borrowed stuff from other routes.