The Seventh Avenger

We all know the Story of Avengers. A genius who built tech, A soldier frozen in time, God of myths, A scientist who got more than he bargained for, And two assassins tighter than siblings. Their Unification to fight for humanity is beloved and retold over and over. This is a slightly different retelling. There's one more member.

CMD21^&<3
" There's no records of you anywhere."
" My family comes from a pocket dimension, and I'd rather keep away from public eye. Seeing as I'm on the run."