From Shoryuken Wiki, Marvel vs. Capcom 3 Strategy and More!
Umbrella, more than anything else, wants to follow the Skull Heart with her older sister. Parasoul stays classy and keeps Krieg quiet in combat for a disciplined and efficient fighting style, which sets a fine example for Umbrella. Unfortunately, the younger sister doesn't have the maturity to control her living weapon in combat. Hungren's bond with his young mistress means he's growing too, but it doesn't show through spunk or ambition; he's driven to grow huge by an insatiable hunger, or possibly a character specific resource meter. He's as spoiled as Umbrella! If he can't get a bite to eat in a long fight, he'll deal ravenous damage later. Umbrella knows that if she's losing, Hungren's appetite can get unpredictable, unfair, and downright nasty for her opponents.