"bodhi rook had only ever doubted himself, and today was no exception." - rogue one novelization

Bodhi Rook is about as average as they come. Not a mystical being with incredible abilities, or a fierce warrior. He's just... himself. He grew up in an Imperial occupied city, got into trouble with the law on a few occasions in his youth, and grew up to work for the Empire as a cargo pilot. There aren't many opportunities for someone like him, much less in a war zone like his home, and so he enrolled in the academy with hopes of becoming a fighter pilot. But after failing his tests, he's assigned another, less glorious job.

A little hot-headed, his self confidence begins to deteriorate over time, and he begins to second guess and doubt himself. His anxiety begins to become a problem, he takes up gambling, and becomes withdrawn.

But it's a job - he's good enough at it, not great. Pilots are common, and low on the chain of command - perhaps even lower than the Stormtroopers, so he doesn't stick out at all. He just needs to keep his head down and do it, which he does. Ignoring all that's going on around him. That he's delivering supplies of goods to the Empire that are native only to Jedha, his home. He does it until he discovers what it is that he's being an accessory to. The building of a giant super weapon that can destroy planets in it's wake. Those crystals he'd been entrusted to deliver are to be it's power source.

It's enough to push him into realizing that he needed to leave, that he didn't want to be a part of this. Somehow he caught the attention of the head scientist on Eadu, where the weapon is being built, a man by the name of Galen Erso. Despite his many misgivings, he agrees to take a message at the man's behest to a rebel revealing a flaw on the machine that will destroy it.

But Bodhi - he doubts himself, he doesn't see his actions as brave or worthy of praise. Maybe, if he was brave - he would have defected a long time ago. He believes that by defecting, and delivering the message and what is hopefully a killing blow to the Empire, that he can make up for what it is that he's done. Despite his minor position, he feels responsible for the evils that they've created - that by doing this he can undo some of it.

And Galen is counting on him to succeed. If the weapon can be destroyed, there's no telling how many lives will be spared.

"He said I could do right by myself. He said I could make it right if I was brave enough, and listened to what is in my heart." - rogue one novelization

It is bravery, though. Just the kind that comes from fear and desperation. And he is desperate. Especially when upon his attempt to deliver Galen Erso's message goes sideways he finds himself captive of the very man he'd been trying to find. Despite Bodhi's desperate pleading, despite his anger at the rebels for their inability to see him in his Imperial uniform as anything but another piece in the Empire's war machine, and the way he tries to fight, he just wants them to see before it's too late - he's taken to something called the Bor Gullet, which is a creature that is able to see when someone is telling the truth or not.

The problem is the side effects and lasting problems that it leaves behind. It tears through Bodhi's memories, and leaves them out of place. Not lost, but simply misplaced, not the order that they should be. It leaves him sometimes unable to tell what is real and what isn't, unable to recall some things, and getting lost in his head from time to time.

Despite that, he manages well enough or at least becomes good enough at pretending that he's coping with it, that his mind is intact, and increasingly has moments where he seems more like his old self.

He tends to wear his emotions on his sleeve. Joy, pain, fear, anger, sadness.. Bodhi feels a lot. He blames himself for not being enough, for being too late when it comes to the destruction of his home by the Death Star. He takes failures to heart.

The anxiety that has plagued him becomes a lot more visible - tends to ramble, he's twitchy, especially after Bor Gullet - and seems constantly afraid and jumpy - or at least, out of his element. It's worth nothing that he's not a soldier, or a fighter like most of the rebels, but he's also one of the first people to stand beside Jyn's plan to steal the plans because they have a chance here and he's determined to see this thing through, even though it means throwing himself into a fight. Galen died to give it to them, and he still wants to make amends. Even knowing that it's a suicide mission. It's safe to say he's loyal to the man, and the people that he's met along the way, as well.

And he's determined and intelligent, enough so that he's able to even defect and not get caught right off. Despite his doubt, Bodhi works well enough under pressure still, and it's through his knowledge of the workings of the Empire and a bit of quick thinking on his part that they're able to sneak onto Scarif, the base where the plans for the Death Star are kept undercover, and then able to transmit the message. It's not until that very moment, after he runs out into the open, under blaster fire, and is able to get into contact with the rebels beyond the shield gate to tell them what to do does he finally feel that he's done enough to make up for what he's done, only a few moments before a grenade is tossed into his ship, killing him instantly.