Role Playing in any Fallout or Elder Scrolls game is never impossible.
Let me show two of my characters, one from Skyrim and one from Fallout 4(I don't have the game yet and I've already got her backstory laid out).
Name: Christine Ryker
Age: 19
Race: Imperial/Akaviri
Place of birth: Province of Cyrodiil
Class: Ranger
Skills: Light Armor, One Handed, Archery, Lockpick, Sneak, Pickpocket, Alchemy, Restoration, and Illusion.
Biography of life prior to the events of Skyrim:
Christine was born in a small village in Cyrodiil. Her mother, Ritta Ryker, was an Akaviri and her father, William Ryker, was an Imperial. Her father also served as a Captain in the Imperial Legion. Both her parents, as well as herself, her twin brother, and her younger brother and sister were worshipers of Talos, but they kept their beliefs hidden for fear of reprisals from the Thalmor. The only person outside of her family that knew this, was Captain Ryker's commanding officer, General Tullius.
At the age of ten, Christine witnessed the destruction of her village by bandits. In the ensuing chaos, she was separated from her siblings. She managed to escape. Her parents were both murdered by Thalmor assassins as they were returning to the village. She managed to seek refuge in a nearby farm where she stayed until she was taken to an orphanage in the Imperial City. She stayed at the orphanage until she was 15, after which she left. During her time at the orphanage, she developed an interest in lockpicking. She would often sneak out at night, and became very good at it.
After leaving the orphanage, she decided to put her talents to use. As she sought employment, she learned that the reason her parents were killed was because a corrupt Imperial officer had learned of their beliefs and sold them out to the Thalmor. Wanting revenge, Christine decided to hunt him down. Using her skills, she learned of the Officer's identity from the Legion, sneaked into his home, and killed him. A week later, she was contacted by the Dark Brotherhood. Apparently, the DB had been contracted to eliminate the corrupt Imperial Officer, but she beat them to it, and they decided to offer her a place in their group. She decided to join the Dark Brotherhood for the sole purpose of eliminating the corrupt from the world, but she had one rule: She would never murder an innocent.
During her six month time with the Brotherhood, Christine excelled in the use of Illusion Magica. However, one day, the DB received a contract to eliminate a corrupt politician. Christine was given the assignment, and she carried it out. However, she later discovered that the politician was in fact an innocent. The person who contacted the DB was in fact a corrupt politician, and wanted to remove opposition. Outraged, Christine returned the money she was payed for the job, and informed the group she was leaving. The group informed her that once she joined, she couldn't leave. Christine was further enraged by this, but decided to wait for the appropriate time to make her move. During the night, Christine slipped some sleeping powder into all of the wine bottles the group had, she'd already made it known that she didn't care for wine. The next night at dinner, all of the members of the DB passed out from the wine. Christine retrieved the group's gold, set the hideout ablaze, and made her exit. She left the gold with the widow of the politician she had murdered as penance. She then tracked down the corrupt politician and slayed him as he slept.
A few weeks later, as she was walking through the bustling market in the Imperial City, a merchant named Zander, tried to sell her some fake merchandise. Christine had developed a keen eye during her time with the DB, and so she was able to see through Zander's scam, and called him out on it. Realizing she had enormous potential, Zander decided to recruit her into the Thieves Guild. She accepted the offer, and became a member of the Thieves Guild. For two years, Christine excelled in lockpicking, pickpocketing, and sneaking, quickly becoming one of the best in the Guild. However, during one job, she accidentally killed a bystander. The Guild leaders wanted to punish her for violating their code. Zander asked for leniency towards Christine, claiming the death was an accident, instead proposing that she not be paid at all for the job, instead of the harsh penalty they had in mind. The Guild leaders accepted his proposal, and denied Christine her payment for the job. After two and a half years with the Guild, Christine decided to retire. Zander was sad that she was leaving but wished her luck and gave her 5000 septims.
After leaving the Guild, Christine became a Bounty Hunter. She quickly became one of the best in Cyrodiil, excelling in the use of swords and bows, as most of the bounties were wanted either dead or alive. A year and a half after she took up the Bounty Hunter trade, she was pursuing a man wanted for numerous crimes, including murder. She tracked the criminal all across Cyrodiil, eventually learning that he'd crossed into the province north of Cyrodiil. Not knowing what else to do, Christine had little choice but to cross the provincial border into Skyrim.
Interests:
Christine has shown a great interest in the Dwemer. Once when she was five, she wandered away from her village, and ended up in an ancient Dwemer fort near her village. When he learned of her disappearance, her father lead a squad of Leigionarres into the fort to rescue her.
Personality:
Christine has a sense of honor. She will not tolerate betrayal. Once, during her days with the Thieves Guild, a member of the Guild stole gold from the Guild's vault. The Guild leaders considered this a betrayal, and tasked Christine with eliminating the rogue Thief and recover the gold he stole(this was one of the rare instances in which murder was sanctioned by the Guild, as the Guild has a rule of No Killing). She will help people who are not capable of helping themselves.
Chosen side in the CW: Christine decided to follow in the footsteps of her father, and decided to join the Imperial Legion.
Fallout 4:
Name: Christine Ryker
Gender: Female
Race: White Caucasian
Occupation: US Army Ranger/Housewife/Mother/Wasteland Ranger
Christine Ryker served as a Ranger in the US Army, stationed in Anchorage, Alaska during the conflict between the US and China.
While out on patrol, Cpl Ryker and her squad came under fire from Chinese forces. Christine and her CO, Lt Maxwell were both wounded. Christine took two bullets in her left arm. Lt Maxwell's wounds were more serious.
Despite her wounds, Christine took command of the squad and led them to a small nearby town.
Because of the town's proximity to a Chinese base camp, and periodic harasment and threats from Chinese forces, the town's citizens were hesitant at first at giving shelter to US forces.
Christine, seeing their troubles, convinced the town to stand their ground, and fight back.
Armed with weapons that they had obtained from a hidden cache underneath the town hall, the town's citizens and Army Rangers, under Christine's leadership, fended off the Chinese soldiers.
The Rangers and citizens held back the Chinese long enough for the 405th Ranger Regiment to arrive to privide support for the Corporal and her troops.
During the siege, Christine was injured a second time, this time a bullet from a sniper rifle went right through her right leg.
Despite the injury, Christine was able to locate the sniper, a member of the Crimson Dragoons using a stealth suit with the stealth field active. Christine drew a bead on him and put a bullet right through his visor.
With the arrival of reenforcements, the Chinese were forced to abandon their base camp and retreat.
The victory was shortlived as Christine discovered that during the siege, Lt Maxwell had died from his injuries. Before passing on, he left a note detailing her bravery and determination and recommended that she be nominated for the Congressional Medal Of Honor.
While recuperating at the 4075th MASH, she was informed that the sniper bullet did more damage than they could handle. She was going to be discharged and sent to Boston where she could recieve better treatment.
Her CO, Captian Barnes later informed her that not only was her MoH nomination approved, but that he had recieved special permission to advance her in rank to First Lieutenant.
After returning home, Christine married her High School sweetheart, Jake Anderson. They had a son named Shaun. Seven months later, the bombs fell.
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These are two examples of how you can role play a character. But the point here is that it is very easy, and very possible to role play in Fallout 4. You could even do that in Fallout 3 if you really really think about it. It's not that hard at all.