The last names of the characters are simply not used. One of the possible reasons could be that during that time period (based around ancient Asian societies), last names weren't as necessary as where the characters were from. (Ex: Katara of the Water Tribe; Sokka of the Water tribe.)
Toph Bei fong is an exception to this rule- though it could be because she comes from a wealthy/well known clan or family.
they both have the name Avatar in the name.
It doesn't say the last names of any one on Avatar except Toph
Avatar:The last air bender's name is Aang.
Tha airbending avatar before Aang was Avatar Yang Chen, and there are lots of statues of her in the series.
Momo.
The name of the Avatar last Airbender is Aang
they both have the name Avatar in the name.
The Last episode was Avatar Aang which was part 4 of Sozin's Comet
Toph is the blind bandit in avatar.
It doesn't say the last names of any one on Avatar except Toph
Avatar:The last air bender's name is Aang.
Tha airbending avatar before Aang was Avatar Yang Chen, and there are lots of statues of her in the series.
i do not know who you mean by nata because there is nobody by that name in avatar the last airbender
Toph's last name is Bei Fong. She is one of the only characters on Avatar: The Last Airbender to have a family name.
Momo.
Theres was no song it was like a Chinese music thingy.
That would be the Avatar State.