Question: feh how to get byleth?
Answer: Step 1: Confirm that the same Nintendo Account e-mail address (or login ID in the case of a child account) is displayed both on your Nintendo Switch system and in Heroes. ... 
Step 2: Purchase Three Houses.
Step 3: Earn Gold Points** by June 29, 2020.
Step 4: Open Heroes and accept Byleth: Tested Professor.