The only character from 24 to return for 24: Legacy was Carlos Bernard’s Tony Almeida, and hardly any of his history the original show was touched upon.
Coral Peña’s Mariana Stiles was also the cousin of Edgar Stiles, a CTU analyst from 24 Seasons 4 and 5, but that’s where 24: Legacy’s ties to 24 ended; it was very much a standalone show.
All of 24: Legacy’s main cast was comprised of new characters, including Eric’s wife Nicole, played by Anna Diop; former head of CTU Rebecca Ingram, played by Miranda Otto; current CTU head Keith Mullinsm played by Teddy Sears and presidential candidate John Donovan, Jimmy Smits.