Suggestions by @the_writer

Weezer

as Composer in Avery

Sacha Baron Cohen

as Sam Gordson in The brightest star

Darren Criss

as Dale Summerland in The brightest star

Jack Black

as Marley Frankton in The brightest star

Danny McBride

as Kody Simpson in The brightest star

Will Ferrell

as Gaffigan in Avery

James Franco

as Kristoffer in Avery

Josh Gad

as Oddy in Avery

Jason Sudeikis

as Aaron in Avery

Danny McBride

as Avery in Avery