The voice actors in Avatar: The Last Airbender by character are:
Aang: Zach Tyler Eisen
Katara: Mae Whitman
Sokka: Jack DeSena
Toph: Jessie Flower
Zuko: Dante Bosco
Uncle Iroh: Mako (Seasons 1 and 2)/ Greg Baldwin (Season 3)
Suki: Jennie Kwan
Azula: Grey DeLesile
Firelord Ozai: Mark Hamill
Appa/ Momo (And all other Avatar animals): Dee Bradley Baker
For More information on Avatar voice actors you could go online to Avatar Wikia for a list of all voice actors of Avatar: The Last Airbender. I only included the Main character's voice actors.
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Aang was Zach Tyler Eisen. Katara was Mae Whitman. Sokka was Jack DeSena. Toph was Jessie Flower. Appa and Momo were Dee Bradley Baker. Zuko was Dante Basco. Fire Lord Ozai was Mark Hamill. Hakoda was Andre Sogliuzzo. Uncle Iroh was Mako for the first 2 seasons and then Greg Baldwin for season 3. Suki was Jennie Kwan. Azula was Grey DeLisle. Mai was Cricket Leigh. Ty Lee was Olivia Hack. Admiral Zhao was Jason Isaacs. Long Feng was Clancy Brown. Bato was Richard McGonagle. The Earth King was Phil LaMarr. Princess Yue was Johanna Brady.
Aang- Zachary Tyler Eisen (originally Mitchel Musso), Katara- Mae Whitman, Sokka- Jack DeSena, Toph- Jessie Flower, Zuko- Dante Basco, Azula- Grey DeLisle, Ty Lee- Olivia Hack, Mai- Cricket Leigh, Iroh- Mako (season 1- 2), Greg Baldwin (season 3), Momo and Appa- Dee Bradley Baker, and Ozai- Mark Hamill
If you mean who played the Na'vi female, that was Zoe Seldana. The female scientist was Sigourney Weaver
Mick foley
Mae Whitman in Avatar: The Last Airbender and Eva Marie Saint in The Legend Of Korra.
Kelly Hu voices Stacy.
Kelly Hu voices Stacy.
Dan Povenmire voices Doofenshmirtz.