The following is a list of characters that first appeared in the BBC soap opera East Enders in 2017, by order of first appearance.
All characters are introduced by the show's executive producer Sean O'Connor or his temporary successor as creative director, John Yorke.
Morris's casting in East Enders was revealed on Twitter by D&B Performing Arts, while a show insider told Digital Spy that "we'll be seeing more of Keegan in storylines with Shakil, Louise and Bex, as he continues to cement his reputation as a troublemaker." Duncan Lindsay from Metro said that through the young characters, East Enders "is nailing the representation of the various young characters you find in school environments" and that Keegan is a complete bully.
He also said that Morris is "deliciously contemptable as Keegan, a character we are meant to hate." Kilkelly later named Morris one of "Soapland's rising stars", praising the decision to introduce a family for Keegan and suggested that this could be used as "a great opportunity to explore Keegan and what makes him tick".
The following month, Preston Cooper (Martin Anzor), a student with whom Michelle Fowler (Jenna Russell) had an illegal relationship in the United States, and Konrad Topolski (Piotr Baumann), a love interest for Shirley Carter (Linda Henry), made their first appearances.
Josh Hemmings (Eddie Eyre), a love interest for Lauren Branning (Jacqueline Jossa), and Tommy, a friend of Jay Brown (Jamie Borthwick), debuted in March.
Keegan Baker, played by Zack Morris, is a friend of Shakil Kazemi (Shaheen Jafargholi) who also goes to school with Louise Mitchell (Tilly Keeper), Bex Fowler (Jasmine Armfield), Travis Law-Hughes (Alex James-Phelps), Alexandra D'Costa (Sydney Craven) and Madison Drake (Seraphina Beh).
Ada "Emerald" Fox, played by Doña Croll, is the mother of Denise Fox (Diane Parish) and Kim Fox-Hubbard (Tameka Empson).
While in the local supermarket, the Minute Mart, Keegan attempts to steal a bottle of drink but Derek Harkinson (Ian Lavender) threatens to call the police, and though Keegan says the CCTV is only for show, Derek tells him that may or may not be the case and convinces Keegan to return the drink.
Keegan arrives at Louise's house after Madison and Alexandra invite people.
The following month, Tom Bailey (Daniel Casey), a love interest for Michelle, the Taylor family − comprising Karen Taylor (Lorraine Stanley), Keanu Taylor (Danny Walters), Bernadette Taylor (Clair Norris), Riley Taylor (Tom Jacobs) and Chatham Taylor (Alfie Jacobs) − and Ingrid Solberg (Pernille Broch), a nanny hired by Jack Branning (Scott Maslen), were introduced.
Felix Moore (George Maguire), a market trader, debuted in July.