Mr O'Carroll-Kelly is portrayed as an extreme right winger, with little respect for trade unions, the poor, environmentalism or and state intervention in the economy.
Charles has an inflated sense of self-importance, repeatedly writing to the Irish Times on various issues, convinced that people think of him as a "major captain of industry" and man with his "finger on the pulse of the nation".
This corresponds with his father's inability to provide him with seemingly endless resources of finance and Charles's new-found respect for the less fortunate.
Charles' new found vigor for life after the heart attack lead him to rekindle his relationship with Erika's mother and leave Fionnuala.
The two open a cheesemongers and all is calm in his life until the introduction of a wig he found while moving leads to a massive personality change.
Charles then has an affair with Fionnuala, his original wife who he then returns to and turns to public office once more, starting a new right-wing political party 'New Republic' where he vows to dismantle the current Government and 'Make Ireland Great Again'.
He is elected Taoiseach, afterwards it comes to light that his new found business connections from Russia have been meddling in the social affairs and election systems of Ireland to help him gain power, once in office he begins selling massive sections of Ireland's national forests to the Russians along with other schemes such as turning Athlone into a private prison for European states.
At the end of the 2 most recent novel Normal Sheeple Charles orchestrates a plot to burn down Dail Eirin, hiding his tracks before he is exposed.
After sending Charles to prison by revealing his financial crimes in her first novel, Fionnula becomes an extremely successful public figure on foot of her writing.
Sorcha Eidemar Françoise O'Carroll-Kelly (née Lalor) is Ross's recurring love interest, and eventually his wife.
Her main interests are shopping and watching Friends, Dawson's Creek and The O.C.. Ross repeatedly cheats on her but is possessive of her nonetheless.
Sorcha worked for a short period for Ross's father as a cut-throat human resources manager, helping him to "rationalise" the work-force.
Totally uninterested with the predictable topics her girlfriends talk about (favourite moment in Dawson's Creek, Weight Watchers points etc.).
It is revealed at the end of Mr S and the Secrets of Andorra's Box that she is Ross' half-sister and that Charles O'Carroll-Kelly is her biological father.
In the more recent books with Ronan becoming a sustained character and being widely accepted as the humour of the stories, his adventures have started to take him overseas generally dragging Ross alongside him.
The trip takes them to France where Ronan vanishes into the Red light district of Pigalle in Paris forcing Ross to act as a parent and bring him home.
Honor was cast in the lead role in the TV movie adaptation of Fionnuala's misery-lit novel, "Mommy, they've never heard of Sundried Tomatoes".
Hugo, Cassiopeia, Diana, Mellicent, Louisa May and Emily O'Carroll-Kelly are Ross' brother and five sisters, conceived in vitro in Schmidt Happens and born via six surrogate mothers in Braywatch, the twentieth novel.
However, Christian left for Skywalker Ranch near Nicasio, California, along with Lauren, to join George Lucas's writing team in early 2007.
This ended in disaster as the project ran several hundred million dollars over budget, resulting in Christian's dismissal, following which he and his family returned to Ireland.
JP harbours an intense superiority complex towards members of the working class and common activities include driving through impoverished areas of Dublin shouting "Affluence", "The breadline" and, "The poverty trap".
Was recently supposed to be getting married, but his fiancée left him after she discovered he had maintained an internet gambling addiction (they had met at a support group meeting).
Though they respect each other as rugby players from their time on "the 'S'" ("Squad"- Schools senior cup team) together, Ross and Fionn are almost polar opposites of one another, and as a result the pair have often fallen out with one another.
Fionn's heartache at the end of the 6th book stems from the death of his girlfriend Aoife who dies from the eating disorder she suffered from for years.
His proposed wedding to Ross's half-sister Erika ended in disaster when she ditched him at the altar before she eloped with former love, Argentine show jumper Fabrizio.
Derek "One F" Foley - Sports Columnist from "The Stor" and head of the "Echo and the Moneymen" consortium, who, along with Ross, Christian, Oisinn, Fionn and JP, bought Lillie's Bordello in 2004.
Although being described as beautiful (Ross believed her to look like Katie Holmes), her negative body image and issues with eating disorders lead to cardiac arrest, and subsequently her death at the end of the 7th book.
Claire - One of Sorcha's college friends who is extremely close to her, disliked by Erika as she claimed that she was originally from Dalkey when actually from Bray.
He is essentially a propagandist for the students, teaching them that a good education is irrelevant as they are the élite that will always have the door held open for them no matter what they do in life.
He includes everyone who was on the Senior cup team in the year they won and makes reference to each of their own personal skills and his lack of any except rugby.