We live in a world where bad things happen and we're mortal. So naturally the people who turn to be heroes have to be self sacrificing. This means... yes, they have to be people full of love. If you look at people making those sacrifices, its people with love and courage together. So yes, that's part of why you see a lot of heroes in the Bible, and Jesus too.
I salute Eden above who wasn't afraid to mention Jesus in the comments!
And if you'll notice... very strong leaders, who are good, often do personal sacrifices in achieving their objectives. A current leader in the US, some people didn't notice that he had personally donated out of his own money to many good causes. And that he's spent time off the clock with angel moms. And yet people don't see that he had personally... from his own pocket tried to save people.