How do you unlock The bassist in Lego Harry Potter?

Answer 1

Go down to the lake entrance, at the bottom of the stairs is a grassy area and a couldren that allows you to change characters. Shoot the Blast-Ended Skrewt that appears in the area a few times and he will eventually give you the character crest.

Answer 2

i dont know how to unlock him in years 5-7 but you can find his character token in the level the walliping willow in years 1-4