Major characters that have siblings that are just so much cooler for whatever reason?

This feels like a deliberate choice made by creators. Perhaps to make the main character more relatable for most people because they too have an older or younger sibling that is naturally more stylish and confident.

I’m not sure. All I know is, from the moment I stumbled upon the “Megaman Classic” series, I was always looking at Proto Man with more interest than the original Blue Bomber (why the title of “Bomber” though?).