If you're important, then it's best to stay safe; all sorts of people might bear a grudge toward you for your decisions, because of who you are, because they want your job, or simply because you're important. This goes double in fiction, where there wouldn't be a plot if someone wasn't after your head. Thus anyone who's anyone needs a bodyguard to watch their back. The problem is, anyone who's anyone in fiction is also able to back it up. This trope concerns bodyguards who are a lot weaker than their charges. Naturally, while there's often no explanation, it can be justified: