How/Where could [insert character] be improved and why?
Many people feel certain characters are some degree of underdeveloped, insufficiently fleshed out, irrelevant, weak, or just a little flat for different reasons. In terms of actual proclamation, this is generally limited to why they don't like the character and how they feel they fall a short. So the point of this thread is to encourage people to more probatively consider a character, pinpoint some key areas where they needed work, and suggest how they might have been polished, ideally without [completely] losing the core part(s) of what defined the character(s).
EDIT 12/1/18 : As addendum, what are some character types you don't particularly enjoy, why, and how have/can they be done better?