The actor's character Tyler Moon has a female sibling called Frankie who has been mentioned in episodes but has so far shown no signs of joining her family in Albert Square.
Discipline, speaking to Inside Soap about who could be cast in the role, explained: "I'd like Emma Watson from the Harry Potter films.
"I think Frankie would be younger than the boys, although I don't think there are plans to bring her into the show any time soon. It would be great to meet her in the future, though."
Discipline, who has been appearing on screens since June, also spoke of how much he is enjoying his time playing Tyler.
"I've been on cloud nine all the time," he said. "I've had such fantastic stuff written for me and I couldn't be more grateful."
EastEnders continues on Thursday at 7.30pm on BBC One.
> EastEnders' Moon actors confirm co-star romances
> EastEnders' Whitney has a showdown with Tyler - Spoiler Pictures
> Read more EastEnders spoilers and news
Watch a video preview of Thursday night's EastEnders episode below: