1. Harry S. Stamper (Bruce Willis): Harry is a seasoned deep core driller and leads a team of roughneck astronauts on the mission to destroy the asteroid. He displays exceptional courage and determination throughout the mission.
2. Grace Stamper (Liv Tyler): Grace is Harry's daughter, a NASA employee, and an expert at tracking asteroid movements. She assists in planning and executing the mission.
3. A.J. Frost (Ben Affleck): A.J. is an experienced NASA astronaut and one of Harry's key team members. He is resourceful, intelligent, and develops a romantic connection with Grace.
4. Dan Truman (Billy Bob Thornton): Dan is the charismatic and passionate Director of NASA. He takes a significant personal risk by approving the untested plan to save the Earth.
5. Lev Andropov (Peter Stormare): Lev is a skilled Russian cosmonaut and part of the international collaboration to save Earth. Initially skeptical, he eventually proves his loyalty to the mission.
6. Chick Chapel (Steve Buscemi): Chick is Harry's best friend and a fellow roughneck driller. He brings humor and emotional depth to the team's interactions.
7. Rockhound (William Fichtner): Rockhound is a roughneck driller known for his technical expertise. His contributions prove crucial in preparing the asteroid for detonation.
8. Bear (Michael Clarke Duncan): Bear is a massive and gentle-hearted astronaut assigned to the mission. His strength comes in handy during challenging situations.
9. Freddy Noonan (Owen Wilson): Freddy is a young, enthusiastic pilot who supports the team by ferrying personnel and equipment between Earth and the asteroid.
10. Oscar Choice (Peter Facinelli): Oscar is an astronaut initially sidelined from the mission but joins the team later to complete the detonator setup on the asteroid.
11. General Kimsey (Chris Ellis): General Kimsey is a high-ranking military official supporting NASA's operation from Earth. He provides technical and strategic guidance.
12. Otis (Jason Isaacs): Otis is a wealthy tech entrepreneur who offers alternative, unorthodox solutions to the asteroid crisis. He becomes embroiled in rivalry with NASA's efforts.
These characters come together to form an unlikely team, bringing their unique skills, backgrounds, and personalities to the mission of saving Earth from Armageddon.