Badass: You wouldn't think so at first by he has his moments.
Break the Cutie: Bower is a boy-scout who slowly loses his sanity through out the film.
Claustrophobia: Suffers from it, as shown from his panic attacks when trapped in hypersleep and when he gets stuck when traveling through vents.
Despair Event Horizon: When he founds out that all his love ones are dead he almost gives up on saving the ship.
Bower: There's nothing left! Its gone! There's nothing left to go back to...
Face Your Fears: Bower is a claustrophobe, but being on a ship with cramped corridors and tight vents, he doesn't have much of an option but to face down his phobia.
Especially towards the end where Gallo tries to drive him insane by exploiting this fear. He opens up the control room window revealing nothing but pitch black. Bower has another panic attack due to there seemly being no escape now and is closed in by the creatures.
Gallo: Let go of your fear!
Happy Flashback: Has one about his childhood where he watches TV with his parents when Tanis is discovered and being inspired by the idea of sending people there.
He does remember his wife, Evalon, mouthing the words "I love you". Also flashes back to moments with him holding her hand.
The Heart: Bower acts as this to Nadia and Leland. Wanting everyone to stop fighting each other and start supporting each other.
Bower: I know it's felt like every man for himself. But a little fucking solidarity goes a long way.
The Idealist: Bower is a boy-scout as Payton calls him. He believes there will always be law and solidarity goes a long way.
Loser Protagonist: He enlisted on the mission because there was nothing left for him on Earth.
Made of Iron: He continually gets damaged and wounded but powers through.
Ontological Mystery: He remembers his training and mundane details, but not much in the way of his past.
Stun Gun: What his arm cannon operates as. However, like any real riot-control weapon, it can be very dangerous if used up close.
Tragic Hero: Turns out that the woman he remembers isn't his wife but his ex and she stayed on Earth. After the divorce he had nothing left and enlisted on the flight to found a place in history. He obviously still loves her as he had kept a photo of the woman. Worse is that Earth mysteriously vanished, meaning that she did as well.
The Heart: When Bower has his claustrophobic panic attack when traveling through the vent he lightens the mood by joking that he got the door open. Also, acting as the voice of reason when Bower becomes desperate to found his wife Payton tells him that he should focus on the ship first.
Payton: "We save the ship, we save them."
He also tries to act as the voice of reason to Gallo.
Mission Control: Payton stays on the ship's bridge for pretty much the entire film, directing Bower and helping him when he can.
Ontological Mystery: He's suffering from short-term amnesia from the cryo-sleep, and his conflict with Gallo on the bridge is his mind trying to resolve this.
Played By: Cam Gigandet
Ax-Crazy: Gallo becomes increasingly unhinged and violent.
Mr. Fanservice: Gallo played by pretty boy Cam Gigandet is naked in this.
Sanity Slippage: Progressively goes through this on the bridge with Payton.
Character Development: She drops her egocentric mindset and actually shows some solidarity by actually caring about Bower's search for his wife. This happens after Bower saves her from being eaten a couple of times.
Nadia: We were meant to go on. And we were meant to survive. And now that's more important than ever.
It's All About Me: Due to the fact that there is no rescue, turning back, and the flight crew seemly dead Nadia has developed an "every man for himself" attitude. She mugs Bower for his supplies(and shoes) and is willing to leave Mahn behind in the Hunter's hunting ground because he is slowing her down.
Justified Criminal: During the first mugging she says that she'll gut Bower if he resists. However, during her second mugging attempt where Bower resists and falls from a great distance she asks him if he is okay instead. Indicating that what she said was an empty threat.
Took a Level in Kindness: She gives Bower emotional support to remain optimistic after founding out the woman actually left him and vanished along with Earth. This is right after he saves her from being eaten by Leland and this her way of showing gratitude.
Nadia: Well...she saved your life.
She also offers him grasshoppers and he accepts, which disgusts Mahn.
Also tries to keep Bower from going insane and defending him from Gallo.
Unreliable Expositor: Nadia thinks that the creatures are crew/passengers who have transformed, but that just doesn't add up.
Workaholic: Her motive for enlisting on the mission was that it didn't feel right handing off the genetic samples of earth's biosphere she worked seven years to get. So she volunteered to go along with it and still protects it when the ship goes to hell.
Despair Speech: He has a very pessimistic view of the situation. No rescue since Earth is gone and they lost control of the ship. So there is nothing left to live for other then go by survival instinct.
Leland: I wouldn't have survived this long if I had a heart. You know, a strange thing, the survival instinct. I mean, there's nothing really left to live for.
Ax-Crazy: Gallo suffered from pandorum after the transmission from Earth, and went completely insane. He slaughtered his crewmates and claimed himself to be King of the ship for an unspecified length of time.
Big Bad: Everything going wrong on the ship is due to Gallo: the power loss, the abandonment of the original mission...he even created the Hunters.
This ship is a seed which we can create a new world! Raw! Natural state! Beautiful! Perfect!
God Is Dead: This is Gallo's claim and his justification.
Manipulative Bastard: Gallo managed to influence an entire culture through his insane rantings and control of the ship.
Misanthrope Supreme: Gallo rants about how the aspects of human civilization such as law, order, morality are petty concepts which led to overpopulation. That they should create a new world to replace humanity with the ship in a natural state, which is an obvious reference to the tribal Hunters.
Motive Rant: He gets a downright impressive rant during the climax.
"You have to let go of your petty concept of reality. That's just baggage from the old world and we both know that didn't work out very well now, did it? They fucked up our planet. Life eats life. And all that's left is what is."
Order Versus Chaos: The battle between Payton and Gallo, sanity and insanity, the person he once was and the person he became.
Satanic Archetype: Who Gallo seems to be a metaphor of based on his negative views of God and morality. Also, there is Leland's statement.
Leland:He was both God and the Devil!
The Social Darwinist: Gallo believes that literal dog eat dog tactics would prevent overpopulation from happening again.