Big Mouth has named its new Missy, with comedian Ayo Edebiri stepping in after Jenny Slate decided to step back earlier this year. Edebiri (who has also joined the show's writers' room for Season 5) will be first heard playing the character in the penultimate episode of Season 4, because thanks to the magic of animation, the folks making Big Mouth were well into the production process on the upcoming season when the decision was made. In fact, even as the pandemic quarantine continues, creators Andrew Goldberg and Nick Kroll have continued working on the animated series about the …