In LOK, we either got to see flashbacks of the original Gaang, or one of their descendants. Apparently, Bryke thought it was enough to just show us Zuko's grandson being amazing and beautiful, and not show us Zuko himself.
So here you go! A comprehensive (four panels, yo,
) comic of old Zuko. He is not a scary old guy who likes to antagonize newfangled notions and today's young people. He aged well like a fine wine. Or a fine tea. And he can firebend with his eyes.
Oh, and where did the teapot and teacups go between panels?? I believe Zuko crushed them in his anger. They're powder now, you can't even see the shards. Yep.