The phrase "a core character" is correct and usable in written English.
It can be used to refer to a central or essential character in a story, narrative, or context.
Example: "In the novel, the protagonist serves as a core character, driving the plot and influencing the other characters' development."
Alternatives: "a central character" or "a key character".
When the ABC drama "Lost" had a core character, Charlie, played by Dominic Monaghan, drown trying to save his friends, the show's top producers were inundated with protests.
A core character of the series, he is voiced by James Harper and is the primary subject of the novel I, Mengsk.
Red Rackham's Treasure has been cited as one of the most important installments in the series for marking the first appearance of eccentric scientist Cuthbert Calculus, who subsequently became a core character.
Goffman said that the show's creative team wanted to demonstrate that Ichabod and Abbie's war with powerful supernatural elements has a serious cost, and obviously ending the life a core character is a serious repercussion for the team.
UGO included Jill on the lists of top 11 "videogame heroine hotties" in 2007 (at third place) and among top 50 "videogame hotties" in 2011, noting her to be a core character of the Resident Evil series and citing her high popularity.
The price we pay for excessive real-life reinvention can be the loss of our own best self, a core character with potential for change but held together by some version of the Golden Rule -- treating others as we would like to be treated.
(In a statement, Mr. Cates said he supported the contest because being "smart about money" is a core part of character building for teenagers).
(While the episodes available to critics didn't show Karolina struggling with her sexual identity, Gardner confirms that it's a core part of her character's arc this season).
I saw the importance of Karolina Dean, a gay superhero...it's a very special role". (While the episodes available to critics didn't show Karolina struggling with her sexual identity, Gardner confirms that it's a core part of her character's arc this season).
Rare for an actor, his core character strength is a work in progress that leaves artifacts - films, public appearances, mischievous pranks - for us to decode.
I found myself yearning for a more streamlined approach to storytelling that focused on a few core characters and did a better job of building narrative tension.
