The actress, who plays Cora Cross, singled out the newcomer when asked to name her favourite character during a live Daybreak interview this morning (November 15).
Mitchell told show hosts Lorraine Kelly and Aled Jones: "Oh God, I like all of them. Well, I'm particularly interested in my young grandson [who's] coming in. But I mustn't talk about that!"
© Rex Features / Steve Meddle
Pictured: Ann Mitchell on Daybreak.
Last week, EastEnders bosses announced that actor Khali Best had been cast as Dexter, who is the 20-year-old son of Cora's long-lost daughter Ava (Clare Perkins).
Speaking this morning, Mitchell said that she is delighted to be exploring Cora's past with the ongoing Ava storyline.
She commented: "It's fascinating, because you get a chance to bring a different facet to each scene.
"One of the scenes we did at the end of the day, and we did it in five minutes - we were up against the clock. That was the most emotional scene. It was strange, to do it so quickly!"
© BBC
© BBC
Mitchell added that the public's response to Cora has been "fantastic" and "very, very positive" since her debut last year.
She explained: "They seem to welcome the complexity. They like the darker side, and they like the funny side."
EastEnders continues tonight (November 15) at 7.30pm on BBC One.
