How about everyone? Everyone in TFA aside from the two I mentioned are either severely underdeveloped or just there to advance plot or spout exposition.
Yeah, totally cared about Poe, the guy who spent like five minutes in the movie. Great stuff! Oh, and I of course felt a deep connection to Cpt. Phasma and her 2 scenes.
Finn should have been cool, but his character goes nowhere and his background and conflict with it isn't explored enough. Maybe in the next film.