Character who we got a peek of that you’re really craving backstory and details for?

I know the classic answer is Tony's sister Barb.

I've been rewatching random episodes recently and I'm really fiending for some more info about Ally Boy Barese. He's the acting head of the family's biggest crew but we rarely see him. Also he seems to be closer to Chris in age, so he's obviously very successful at a young age as well, but seems to have his shit together and the respect (albeit begrudgingly by Paulie) of the family's higher ups.