Here are mine from my fanfic in progress at the moment, which I'll start releasing soon. All three are individual Skyrim characters I decided to link together their past lives, and present for that matter:
KASAI RAIDO - At the start of the game, Kasai is a 20yo Redguard, born on Stros M'Kai and raised at sea for most of his childhood. He's the first son of Shinji Raido, a fairly well-known Redguard privateer and adventurer (who was based in large part off my Oblivion character, but unrelated) and Kena Stormbinder, an Altmer dissident of the Thalmor.
Following the death of his parents, Kasai takes it upon himself to complete his father's life-long quest of reviving the ages-old tradition of the warrior band of Yokudan swordsmen, known as Ansei, that had to date remained lost to history. After great effort, ultimately Kasai becomes the first known master-level Ansei in at least 2 eras.
Skill-wise, Kasai was a mix of his parents. He got a decent bit of magic ability from his mother, though he uses it quite sparingly, sticking mainly w/ restoration and a smattering of the other schools. Like his father before him, Kasai is a master swordsman dedicated to the "way of the sword." He possesses a strong sense of honor and duty, and will willingly place his life on the line to fight for someone or something important to him. He is motivated by the desire to protect those close to him and the times that he is unable to do so serves as motivation to get stronger.
In the game's storyline, Kasai is my lone dragonborn character. He advances through the ranks of the Companions and becomes Harbinger. His intuition leads him to the College of Winterhold when he senses some sort of pending danger, which ultimately is the Eye of Magnus incident. After defeating Ancano, he is given the title of Archmage, which he accepts but gives most of those duties to his new Master Wizard, Tolfdir.
Kasai plays major roles in defeating the vampire lord, Harkon and the first dragonborn, Miraak. He reluctantly sides with the Empire in the Skyrim civil war due not to his overwhelming allegiance to one side, but is desire to bring an end to the war as quickly as possible so that the pending new great war with the Dominion can be fought with more strength.
As he decides to retire from the life of a fighter, Kasai founds a training school, like many of the old Ansei masters, in order to pass along his skills to a new generation of swordsmen whom he finds worthy of wielding such a power.
In his personal life, Kasai marries Aela, and the two adopt Alesan from Dawnstar and later have a son of their own as well.
KAROLAS RIVERWIND - Karolas is a 26yo Bosmer at the start of the game. A year prior to that, Karolas sees Kasai getting jumped by a large number of bandits, so he jumps in to even up the odds a little bit against the bandits. Ever since that moment, Karolas and Kasai have been the best of friends and rarely will you see one without the other being somewhere near by.
Karolas was raised by his father near Arenthia in Valenwood. His father passed on his mastery of a bow and short sword to his son and the two would often go on extended hunts all over the countryside. Karolas never knew his mother as she died during his birth. Growing up, feelings of guilt and anger over his mother's death seemed to push him into getting in a lot of dumb fights. On his deathbed, his father begged him to give up those feelings as they do nothing but destroy a person. He also made Karolas promise him that he wouldn't get into any more fights until he found something worth fighting for. Karolas' story in Skyrim is his journey to find out just what that "something" is.
Through the years the two know each other, Karolas takes a good bit of time teaching Kasai mastery of the bow, and Kasai reciprocates that by teaching Karolas the art of swordsmanship. Karolas eventually joins Kasai in the Companions and plays a major role in many of the events of his life.
KHAGRA gro-MARZISH - Khagra is a 24yo Orc at the start of the game. He was raised by his parents in the Cyrodiil city of Anvil. His father, Shura was formerly in the legion. Shura was also a close personal friend of Shinji Raido and his personal blacksmith. Along with Khagra, Shura would go on-board with Shinji for numerous journeys. This is ultimately how Khagra and Kasai became close.
Over time the relationship between Khagra and Kasai became almost identical to the relationship between both of their fathers. Like his father, Khagra is a master smith and a highly skilled warrior. He prefers greatswords and battle axes but is skilled with a bow and most other types of weaponry.
Though he parts ways to take care of personal matters several times, Khagra re-encounters Kasai on quite a few different occasions and the friendship between the two always remains strong.