Nothing much worse than....

A player who has something to prove to themselves/an ego. You know what I mean that person in game who picks something they shouldn't and then they do terrible. Like they pick an "op" or flashy champion without knows how to use them. Or they feel like they are the main character and that everything has to be handed to them as the role they want,the champion they want, and then they constantly ask for assistance but god forbid you don't give it to them because at least if you do you might be able to keep them from dying since they can't handle themselves and have to have their hand held. But yeah if they have an ego then they are gonna do something dumb and sadly they aren't gonna learn or listen afterwards a good 90% of the time. Anyways guys just try to the lose the egos and use your brains this game becomes a lot easier.