The Showtime series based on its British predecessor of the same title featured an ensemble cast, but Rossum, who portrayed older sister Fiona Gallagher, and William H. Macy, who played patriarch Frank Gallagher, were the leads.

And perhaps because of that, Emmy's presence was felt particularly strongly by the cast and crew.

"It was weird at first for sure," Emma recalled of Rossum's departure after nine seasons, "but it also – the set became more of a positive place, I'm not gonna lie."

"I remember pre-[Emmy] leaving, I'd go to set some days and I'd be very anxious about having a scene with her because if she had a bad day, she made it a bad day for everybody," Kenney added in her chat with Alex Cooper on the latter's Call Her Daddy podcast.

Emmy and Emma – who portrayed Debbie Gallagher – were both with the series since its inception in 2011. The two played siblings who did not always see eye to eye, and for Kenney, life imitated the art.

She said the two had what felt like a "sister relationship," though she noted it was "in good and bad ways."

Kenney essentially grew up on screen (she was 11 in Season 1), but Rossum was also fairly young (24).

She said her on-screen big sis would often switch between being a "good influence" on her, and other times when she would give her "not the best advice."

"Growing up I definitely took a note from – not just her in particular – but people and things that I want to carry on in my life and things I do not want to carry on in my life," explained Kenney