I'm not even sure what her "cause" is. I'm pretty sure there are other people out there more worthy of the title Hero than Lady Gaga. Besides making "music," what does she do to promote her causes and help people? (This is a serious question, I really don't know.)
I think she's a hypocrite, though clever at marketing herself. Pretending she's not influenced by anyone must be very appealing to people who think they are special snowflakes.
I am a massive fan of Tori Amos. Her first album had a song recounting her sexual assault. After I was raped, I found a huge amount of solace and strength in her music. She cofounded an organization meant to help survivors of sexual assault and rape. I still wouldn't call her a "hero." She's a musician and an artist, not a hero.