ABIGAIL is a hero because...it was her dare in I Triple Dog Dare You that defeated Alejandro's chances of winning by severely injuring him. In general, she has always been a sweet person. Though sassy at times, she remains blissfully gleeful and never shows intentional malice towards those who don't deserve it.
BRICK is a hero because...He quit the game in Basic Straining just so he could save his own team from facing elimination. He also honorably found a way to get himself caught in the act of cheating in Get A Clue when Chris forced him to sabotage the others. This was so he would be eliminated and cast away from Chris. It worked. He has also been chivalrous and kind to others weaker than he is.
BRIDGETTE is a hero because...after her boyfriend, Shin, was eliminated she went on to get her own ponytail cut off in order to progress in the challenge during No Pain, No Game. She was eliminated for being a threat, but her sacrifice was highly inspirational. She also dumped Shin in The Princess Pride when he revealed he was cheating. Bridgette, though clumsy, has always helped people up on their feet. Her background of medics and nature make her the perfect deity of kindness.
B is a hero because...he was unfairly eliminated in BOTH of the seasons he participated in. He never took them poorly and accepted them with his head held high. Anyone who's that good of a sport deserves another shot. He has also made many friends even without the sense of speech. He is a silent guardian.
CODY is a hero because...he never let stardom go to his head when he hosted the Total Drama Aftermath show. He was loyal and kind to the people that Sierra was humiliating and berating. Despite the money he could have earned from ruining their lives, he chose the moral path, always.
COURTNEY is a hero because...she was crushed by Mel's sleekness and Duncan's betrayal in Total Drama World Tour Do Over. She stood strong even when her boyfriend left her for someone else. She reconciled in Brick and began dating him, one of the nicest guys on the show.
MIKE is a hero because... he's not. He's really not.
SIERRA is a hero because...she used her money from the aftermath shows to buy her way into Total Drama All Stars Do Over. She's not supposed to be here. Neither is Mike though.
ZOEY is a hero because...she has shown unmeasurable amounts of compassion to Mike, a kid with MPD. Despite what everyone says about him, she somehow sees the good. For being an optimist person, she gains heroism.
Brick was one of the only two heroes to not have immunity for not attaining an egg. He was cast off when his idol was stolen by Mike, unable to defend himself when his team chose Bridgette over him, due to the previous challenge.