Hmm...I've figured out who these girls are...they're all characters from Breath of Fire video games! Staring from left to right: Bleu/Dias (all BOF), Momo (BOF3), Ursula (BOF4), Nina (BOF2), Nina (BOF1), Katt? (BOF2), and Yua? (BOF2). Thought these girls looked familiar...interesting.
I still hate how fanartists "reimagined" Rinpoo with a flat chest. Her official character art and in-game sprite were both rather busty, or at least a large B-cup.
Rinpoo expressed envy of Nina's figure at one point in the game. Specifically she asked Ryu if he thought she'd have a body like her's when she became older.