If you want to know how to recruit Byleth-
I don't know for certain how the Blue Lions route goes since it's the one I haven't played, but I assume recruiting them works the same as Deer and Eagles- in the mission against them where you are warned that your actions will heavily impact the story, you need to ignore Arval when he tells you to attack Byleth and instead leave them alone. You must complete the mission before Byleth returns to the level's boss. If you do so and Byleth is still on the field, the mission will end immediately afterward and you wont' fight Jeralt, and instead both of them will join your army.
I don't know for certain how the Blue Lions route goes since it's the one I haven't played, but I assume recruiting them works the same as Deer and Eagles- in the mission against them where you are warned that your actions will heavily impact the story, you need to ignore Arval when he tells you to attack Byleth and instead leave them alone. You must complete the mission before Byleth returns to the level's boss. If you do so and Byleth is still on the field, the mission will end immediately afterward and you wont' fight Jeralt, and instead both of them will join your army.
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