You've always hated the fire nation, in fact, everyone did. The water tribes, the air nomads, and the earth kingdom. The fire nation were brutual, violent and selfish. They would always cause war. You grew up hating them.
You're a waterbender, learning earthbending in Ba Sing Se until you saw a man wearing a dark hoodie, his eyes were bright red like ruby. You felt intimidated but shrugged the feeling. A few days later, the fire nation suddenly attacked Ba Sing Se. Earthbenders started attacking them back. You fought tons of firebenders but when you finished all of them, you saw a familiar face standing in front of you. It was the man wearing a dark black hoodie, he looked handsome but he was a fire nation. He was looking at you, interested.
"Mm, impressive, You almost finished them. The name's Mel."