Without this team of outcasts and outlaws, the Rebel Alliance would have never destroyed the Death Star. Rogue One: A Star Wars Story shows how the titular ragtag group stole the Death Star plans from the Empire, and it's often regarded as the best of the spin-off movie and the best movie of the Disney era of Star Wars.
To pull off such a mission requires a lot, including intelligence, charisma, and skill. Each of the Rogue One team carries different abilities and skills to the battlefield, some providing more of a physical and tactical challenge to the Empire. Meanwhile, other members are simply not built for fighting on the battlefront.
Bodhi Rook
Played by Riz Ahmed, Bodhi is the defector pilot working with Mads Mikkelson's Galen Erso. Bodhi takes a message to Saw Gerrera's radical resistance group on Jedha only to be imprisoned. However, his mission is still successful as the message is given to Galen's daughter Jyn.
Bodhi ends up becoming the pilot of Rogue One and takes them to Scarif to steal the Death Star plans. It's in this battle where he shows that despite his bravery, he is not a fighter. He's a technical whiz without a doubt and helps to complete the mission, but mostly just dodges blaster fire before dying from a grenade.
Saw Gerrera
Technically, Saw, played by Forest Whittaker, is not an official Rogue One member, but he does play a big part in the team's union and escape from Jedha. In terms of being able to fight, Saw has definitely seen better days. In Star Wars Jedi: Fallen Order, he's not afraid to grapple onto an AT-AT walker. In Star Wars: Rebels, he's ready to take on a hive of Geonosis natives.
In Rogue One, Saw is barely kept alive by his suit and rebreather. He has a limp and has become more machine than man. He likely was able to defend himself from troops, but a blast from the Death Star? All he could do was embrace his demise.
Jyn Erso
Since her father disappeared as a child, Felicity Jones' Jyn has been living as an outlaw. To live in a galaxy where the Empire reigns as a criminal requires some fighting ability. Even when she is in cuffs, she is able to take on multiple Alliance soldiers on her own.
During the climax and the skirmish on Jedha, Jyn Erso holds her own. She's no trained soldier but Jyn manages to take on the Empire and come out alive. Jyn is also a character that never gives up despite all the challenges she is given, which is likely why she and Cassian are the last ones to die in the battle of Scarif.
Cassian Andor
On the other hand, Cassian Andor is a trained soldier who has been fighting evil since he was a child. Cassian is also a mercenary for the rebels, willing to get his hands dirty and follow any order they give him. His morals return to him once he becomes a member and leading figure of Rogue One.
Rogue One showcases that he is a trained sniper, a spy, a pilot, and a warfighter. A jack of many trades whose history and skills are expanded upon in the prequel series Andor on Disney+ with Diego Luna returning to the role.
K-2S0
Played by the talented Alan Tudyk, K-2S0 is a reprogrammed Imperial security droid. Obviously, being a security droid, he is built to fight as shown from how he can lift a human with one hand. Other security droid models like him are some of the most difficult challenges for Cal Kestis in Star Wars Jedi: Fallen Order.
K-2S0 is shown to be even deadlier with a blaster in his metal hands. Displaying perfect accuracy but his hardened design allowed him to take many hits. It wasn't even stormtroopers that killed him, K-2S0 killed himself in order to protect Rogue One.
Baze Malbus
The wise-cracking companion Baze wields an MWC-35c repeating cannon, which is also known as Staccato Lightning. His heavy armor combined with this blaster allowed him to mow through stormtroopers on Scarif and even kill the elite Death Trooper commandos.
Jiang Wen's heavy physicality, his worn costume, and actions on the battlefront hint that Baze Malbus has been in many fights. Even when heavily wounded in the climax, he never stopped and proved to be one of the deadliest members of the Rogue One team.
Chirrut Îmwe
First off, the character is played by Donnie Yen, one of the most skilled martial artists in film history. That already shows that this character can fight, but no better example is shown in the film than when he's confronted with a legion of stormtroopers. This blind monk-like character is able to demolish an entire squad of Imperials with a wooden staff as if it were child's play.
It's heavily hinted that Chirrut uses the Force to sense his way through the world. This would explain his combat efficiency but also why he can shoot TIE Fighters out of the sky with ease. This is why he chants the now-famous line: "I am one with the Force. The Force is with me."