1. Simon Baz
2. John Stewart
3. Jessica Cruz
Guy Gardner as a Red Lantern
Kyle Rayner as a White Lantern
Jo Mullein as a Star Sapphire
1. Simon Baz
2. John Stewart
3. Jessica Cruz
Guy Gardner as a Red Lantern
Kyle Rayner as a White Lantern
Jo Mullein as a Star Sapphire
Personally, I'd keep about 5 of the Corps human GL at this point: Hal, Guy, John, Kyle, and Jessica. But if I had to pick just three...
Hal: He's the de facto main character of the "Corps" version of Green Lantern. He's at the center of most of the more iconic GL runs and stories, and has a huge fanbase. It'd be silly to get rid of him.
John: Has become especially popular due to the JL/JLU cartoon. He's an important character in an era where more diversity is wanted and still very needed.
Jessica: Has become popular in her own right due to non comics appearances, and has an interesting character niche. To me, she's the Barbara Gordon or Kara Zor El of the GL franchise.