Jessie Cave tells Digital Spy that she's someone who "makes stuff", which after having a look around her Pindippy YouTube channel seems like a perfectly fair bit of self-analysis.
Ahead of her first full-length stint at Edinburgh, we spoke to Jessie about her show Bookworm, working with her sister on Mike Newell's upcoming Great Expectations, and of course all things Potter.
What's Bookworm all about?
"The idea is that it's the launch of this book club that I've made and everyone in the audience are members. It's the big day, it means everything to me. It's about introducing the idea of Bookworms United to all these people."
What comedy were you a fan of growing up?
"I grew up with Roseanne, I kind of adore her and stuff like Home Improvement, really traditional American stuff. But as I've grown up The Office... all the videos I tried to do now are really quite deadpan. Hopefully in the show there's a really fine line between what's real and what's pretend."
Do you feel prepared for a month-long onslaught at Edinburgh?
"I do feel prepared, I've planned this to the last minute detail since I decided I wanted to go up in September, and it means organising everything. Everything on Pindippy is stuff I've done, and I do absolutely everything. That's not going to change with Edinburgh."
You've worked with Evanna Lynch and other people on your site and joked that Rupert Grint was too busy washing his hair...
"He really wanted to do a sketch, but he's impressively difficult to pin down. I don't have a team around me like he does, and to get through to Rupert. When we are face-to-face it's all 'Let's do this, let's do this' and then as soon as he's gone, you have to get through all those people again. It's impossible, that's the downside."
Do you still feel part of the famous Harry Potter family?
"It's nice, because I am friends with Evanna, I've just been out to visit her in LA - I'm really good friends with her, we might move in together. It's nice, but you make a connection with somebody. I've made connections with people who weren't necessarily acting in the films."
What would you think about a remake of the Harry Potter series?
"I think they have to. I think you've got to just be at peace with that, that's fine! It'll probably be better. That's fine. They would never have done that first. And also it deserves another life in some form. I was thinking the other day, it's quite sad - obviously it's very sad - thinking about SnitchSeeker, thinking they're only now commenting on Harry Potter actors who have got new jobs, or the Harry Potter Studios, it's quite sad. I was thinking, 'How will it go on?'"
I was thinking a stage thing, or a musical.
"There'll always be parodies of it... It's ripe for it. I think as soon as they write something else, it'll be looked at differently, but for a while it's still so fresh."
You worked with your sister on Great Expectations - was that something you were a bit hmmm... about?
"Bebe got the part because of me. Bebe comes everywhere with me. All of my sketches... she's in Bookworm, she's my sidekick. There's a joke in my play about I bred her especially to be my bookworm and it's true! I have three brothers and I said to my mum and dad, 'You're having another baby!' I just prayed and prayed to have a sister and I did. She was the best gift ever."
You famously introduced Simon Amstell to Twitter, but I don't think he's really got the hang of it...
"I'm like his mentor, obviously I'm awful. I said, Simon, you're going on tour, every time you're in a place tweet, y'know, 'Hello Swansea'. That's nice, it gets them involved. He's done that, but that's all he's done!"
You wrote about the whole thing for The Guardian... do you read the comments or do you not care?
"Simon got me back into reading the comments. I went into it oblivious. What I'm really grateful to Simon for - or bitter, I don't know! - is making me more self-aware. He's very good, he's done this for years. He's got a really good antennae. The initial videos we did were very different. They were more about me investigating Simon, they were much more dramatic. He was like, 'You need to get that out, you need to get that out'. So I'm quite grateful."
You've got 30,000 odd Twitter followers.
"I'm quite proud of that, because when I first got the job on Harry Potter and I was doing [Tom Stoppard play] Arcadia I went on Twitter and immediately because of that summer I got, like, 10,000 Twitter followers and I came off it, but I needed people to go on Pindippy so started it up again in 2010 so I had to earn those followers back."
They're all your own work.
"Exactly, they're all Pindippy/Lavender Brown fans. I've kind of been kicking myself 'cos I should have stayed on it."
What do you like so much about it?
"When I'm not working in a professional capacity I'm writing, and when I'm at home it's a way of having contact with people or communicating. You feel like you've got other people around you. The other side of it is I need them. Why would I expect them to turn up at my shows if I don't communicate with them? And it's a way of expressing myself, so I do enjoy that... You can tell a person's morale from their Twitter feed. I like that, it's so honest. And I like being able to follow people who I respect and admire, and the possibility of them seeing my comment about them. I also think there's an artform to it, because I think there is a way of doing a good tweet - a well-composed tweet."
The second series of Grandma's House seemed to have an even better reception than the first...
"That's 'cos it was so good. I read all the scripts, and they were so good. Obviously the actors Linda Bassett, Rebecca Front, Samantha Spiro, and the director Christine Gernon is like an archetypal female director, she's done everything. She did Gavin & Stacy, she's so good."
Do you define yourself as an actor or a comedian?
"No, I'm not an actor. I don't see myself as an actor. I don't say I'm an actress to anyone, 'cos I'm not."
So do you call yourself a comedian?
"This sounds so bad... but I make stuff. That's what I do, I make stuff. Every day I'm making stuff or I'm writing stuff or I'm drawing stuff or I'm making a prop. I make stuff. I wanna keep making stuff."
Jessie Cave brings Bookworm to Underbelly Cowgate at the Edinburgh Fringe August 4-26 (not 13). Tickets are available now (£9-£10).