blazuki
Please don't become Vaatu's Avatar, all fics do this and it's extremely boring, this story is amazing because the MC is taking firebending to levels never seen before, he doesn't need to bend 4 elements to be the strongest, imagine the fame he will have in the future, the strongest firebender in history, who using only fire and lightning can defeat the Avatar, this is much cooler than depending on an ancient spirit to be strong.