When Aang asked, “But why would I choose cosmic energy over Katara?”

and when Hakoda told his daughter, “You and your brother are my entire world”

and when Katara said, “I thought you didn’t want to help” and Sokka replied, “You need me, and I will never turn my back on you”

and when Toph asked, “Do you really think friendships can last more than one lifetime?” and Aang replied, “I don’t see why not”

and when Sokka said, “It’s Suki!” and later she said, “I knew you’d come”

and when Mai looked Azula in the eye and declared, “Because I love Zuko more than I fear you” and then Ty Lee saved her a moment later without a second thought

and when Iroh grabbed Zuko in a hug before he could even finish his apology and told him “I was never angry with you.  I was sad because I was afraid you lost your way” 

and when Aang turned to Zuko when the battle was finally over and said, “And now we’re friends” and Zuko agreed with a look that was almost akin to wonder, “Yeah, we are”

…that’s love !!