He is the King destined to be seen as an open and informal monarch, with kisses from the public and a facility for speaking from the heart.
Charles has always seemed comfortable on the go, chatting with people who have a story to tell or just eager to meet a prince and heir to the throne.
Now the man who has been a king-in-waiting for decades will be eager to settle into his reign and make the role his own.
There are already signs that Charles’s style will focus on audience interaction and will not shy away from emotion.
Since the queen’s death on Thursday, he has greeted well-wishers on a promenade outside Buckingham Palace twice: on his arrival at the palace on Friday with the queen consort and then again on Saturday night.
Friday’s walk was his first meeting with the public, as his King and the crowds were delighted to see the new monarch in person.
One woman leaned in to kiss Charles’s right hand and another kissed him on the cheek as he thanked people for their well wishes, shaking countless hands after exiting his vehicle in front of the palace.
The king’s address to the nation, televised on Friday night, saw Charles reflect lovingly on his “dear mama”.
The speech moved viewers, with people describing it as “heartfelt” and “personal”, while her mention of the Duke and Duchess of Sussex was met with approval.
He referenced his love for Harry and Meghan, saying: “I also want to express my love for Harry and Meghan as they continue to build their lives abroad.”
Meanwhile, former Prime Minister Gordon Brown said he believes the new sovereign will bring a more informal Scandinavian-style monarchy in the coming years.
“I think what Prince Charles has already indicated is that the monarchy is going to be smaller,” he told the BBC’s Sunday With Laura Kuenssberg programme.
“It will be more like a Scandinavian monarchy in the future, but not in a bad way, more informal.
“He stopped when he walked into Buckingham Palace and talked to people in the crowd, and that was a signal he was sending that he wanted people to feel like he was accessible.”
Elsewhere, the Archbishop of Canterbury said that Charles has the ability to bring “healing” to people just as his late mother did.
Justin Welby, delivering a sermon at Canterbury Cathedral on Sunday morning, said those who knew the Queen “were always impressed by her ability to make them feel as if they were the most important, the only person in the room, the only person in the street, in the crowd”.
He continued: “King Carlos III has the same ability to see the value of each person as God sees them.
“That’s his conscious understanding of people.”
Welby recalled seeing Charles tour the Lady Chapel at Liverpool Cathedral, where there were families of policemen who had died.
He said Charles spoke to the young widow of an officer, adding: “By the time the then Prince of Wales, His Majesty, had made his rounds, he had spoken to everyone in that chapel and to all the people there, and I quote that young man . widow, they felt that they mattered uniquely and found healing.”