Jerkass Woobie: Blonsky. He's trying to kill you, he's a smug jerk to Ross, but in the end it turns out the whole big secret he was keeping in Mission Directive was that he was trying to find a way to save his wife the whole time.
Moral Event Horizon: Blonksy might trying to save his wife for most of the game, but at the end when he's seen he's failed, he decides to cause a flash flood to destroy a major city, just to make Banner suffer, it's clear he's now beyond saving.
Devil Hulk. He's a demonic giant that towers over the Hulk, representing Bruce Banner's abusive father and his own dark desires of anarchy. His glowing red eyes, razor-sharp teeth and deep, scary voice combined with his size and the fact that the recess of Banner's mind that he occupies essentially resembles Hell itself makes him a pretty scary antagonist.
One of Blonsky's files says "No Survivors", while Blonsky himself mutters "I've seen the color of my soul and it's black" over and over.
The Abomination, who plays a lot of the same role with Blonsky that Devil Hulk plays with Banner. The difference being that when he and Blonsky talk, we hear the Abomination's voice but never see him as he urges Blonsky to destroy everything and his prodding succeeds.
The mission where Bruce thinks he's smashing enemy buildings. But as the mission goes on, the player hears the Devil Hulk's voice throughout, urging him to smash and kill.
That One Level: "Protect and Serve", "Lockdown", "Strange Cargo" and "Freedom's Swansong" all come to mind.
The Problem with Licensed Games: Not just averted, but smashed to pieces by the game's outstanding combat engine, entertaining story, and a design team that knew their source material and weren't afraid to make use of it. Many critics said that the game actually succeeded in making them feel like the Hulk.