re: Harry Potter Question: Deathly Hallows

I just checked IMDB and missing characters for Parts 1 and 2 include Regulus Black (whose sole storyline is regarding one of the horcuxes!), Arianna Dumbledore (which I thought they would at least maybe flash back to Dumbledore's early family life, but maybe she just doesn't have a speaking role) and Phinneus Nigellus, whose painting is with them for majority of the storyline to assist them. To me, those characters played pretty darn important parts in the finale