in his and his brother, Edward's quest to bring back their mol from the dead with an alchemy spell, everything goes wrong and his body dissapear. in a desperate attempt, hos brother binds his soul to armour with his blood. later in the series he has a meltdown and asks himself if he really was a human or if those memories are fake. another armour that had his soul binded, got to alphonse head. he really likes cats too