An ego can be good or bad just depending on the individual and how they use it.

Good ego

An example of good ego is believing you are the chosen one around your peers or strangers . This can give you a sense of importance that you can manifest that energy to truly do great things or even influence people into believing you are special.

Bad ego

An example of a bad ego maybe be being too prideful by not mending relationships or problems you cause because you feel that will make you appear weak to yourself even though you truly want to do the right things.