Astrid Eira Dampierre

Astrid is from Faerghus and is therefore in the Blue Lions, but she will automatically join the Black Eagles after Edelgard's decleration of war against the church. 

The exceptions are:

• If Byleth in the Blue Lions route manages to convince Astrid to stay with the Blue Lions.
• If Byleth in the Crimson Flower route convinces Astrid to join the Black Eagles sooner.

Astrid really dislikes the church because her father was executed by them. Her reason for getting into Garreg Mach Monastery is to expose their corruption, and make sure their power decreases so they can't ever unjustly execute anyone again.

Astrid grows feelings for Hubert and Edelgard post timeskip. Edelgard for her dedication to her cause, her bravery, her desire for justice, her kindness and her ambition.

Hubert for his loyality, his cunning, his humour and his intensity.

Astrid is actually a pretty lively person. She loves making people smile and laugh and does her best to be a good friend.