Chapter 2 has plenty of focus on Berdly as is. He's a perfectly functional character, who everyone hates and functions as an antagonist but isn't really a bad person, which is all he needs to be. He gets more focus in the chapter than pretty much any other character already, Susie and Ralsei feeling like holdovers from the first draft who have nothing important to do in chapter 2. Berdly has fun boss fights and dramatic moments, and that's all I can ask for.
Noelle is interesting, like most of the things in this game, exclusively in the context of the hidden Snowgrave route. The boring distraction with Noelle in the middle of Chapter 2 suddenly becomes exciting and dark, her submissive neediness serving as a domestic abuse analogue instead of just being an annoying teenager. Even when replaying Chapter 2 normally, you can see Noelle as a Hulk-type danger, holding back incredible power that she can't control, which helps explain how annoying she is normally. And the route even has a good Berdly moment, for the 5 seconds he's on screen. It really feels like the entirety of Chapter 2 was first built around the hidden route and then dumbed down for the standard playthrough. Oh, and in Snowgrave she basically never mentions Susie, bonus.