Ok so while I could probably list about a thousand more, here are my most wanted guests, I've listed some of their more genre/nerdy credits to better illustrate how they would be a great fit for comic con.
Maisie Williams (Game of Thrones, New Mutants, Doctor Who)
Jennifer Hale (Mass Effect, a billion other video games)
Matt Ryan (Constantine, Arrow, Assassin's Creed IV: Black Flag)
Brianna Hildebrand (Deadpool)
Ashley Laurence (Hellraiser)
Doug Bradley (Hellraiser)
Michelle Rodriguez (Fast and Furious, Avatar, Resident Evil, Lost, Machete)
Aubrey Plaza (Legion, Scott Pilgrim vs. the World, Parks and Recreation)
Pom Klementieff (Guardians of the Galaxy Vol. 2, Avengers Infinity War)
Karen Gillan (Doctor Who, Guardians of the Galaxy, Jumanji, Avengers Infinity War)
Winona Ryder (Stranger Things, Beetlejuice, Edward Scissorhands, Star Trek)
Dave Bautista (Guardians of the Galaxy, Blade Runner 2049, Spectre, WWE, Riddick, Avengers Infinity War)
Zoe Saldana (Guardians of the Galaxy, Avatar, Star Trek, Avengers: Infinity War)
Ruth Negga (Preacher, Agents of SHIELD, Warcraft)
Clark Gregg (Avengers, Agents of SHIELD, Thor, Iron Man 1 & 2)
Ming-Na Wen (Agents of SHIELD, Mulan)
Chloe Bennet (Agents of SHIELD)
Iain de Caestecker (Agents of SHIELD)
Elizabeth Henstridge (Agents of SHIELD)
Camren Bicondova (Gotham)
Tessa Thompson (Thor Ragnarok, Westworld, Creed)
Thandie Newton (Westworld, Mission: Impossible II, The Chronicles of Riddick, Solo: A Star Wars Story)
Bill Skarsgard (It)
Sophia Lillis (It)
Kristen Bell (Veronica Mars, Frozen, The Good Place, Gossip Girl, Assassin's Creed, Heroes)
Charlie Cox (Daredevil, Stardust)
Karl Urban (Dredd, Star Trek, Thor Ragnarok, Lord of the Rings, Chronicles of Riddick)
Carrie-Anne Moss (The Matrix Trilogy, Jessica Jones, Memento)
Tobey Maguire (Spider-Man Trilogy)
Kirsten Dunst (Spider-Man Trilogy, Jumanji, Interview with the Vampire, Fargo)
Willem Dafoe (Spider-Man, Aquaman, John Wick, John Carter, Finding Nemo)
Wesley Snipes (Blade Trilogy, Demolition Man, Expendables 3)
Walton Goggins (Justified, The Hateful Eight, Sons of Anarchy, Tomb Raider, Ant-Man and the Wasp)
Timothy Olyphant (Justified, Hitman, Die Hard 4)
Sonequa Martin-Green (Star Trek Discovery, The Walking Dead)
Hugo Weaving (The Matrix, The Lord of the Rings, Captain America, V for Vendetta)
Letitia Wright (While not a huge star now by july 2018 she will have starred in Black Panther, Ready Player One, an episode of Black Mirror and Avengers: Infinity War so this would be striking while the iron is hot, also she's very talented)
Sarah Michelle Gellar (Buffy, Scream 2, Star Wars Rebels, I Know What You Did Last Summer)
Anthony Head (Buffy, Merlin, Doctor Who, Repo: The Genetic Opera)
also anyone from the Marvel Cinematic Universe (TV or Movies) is welcome, especially since it's 10 years of the MCU.
And in my 'never going to happen but it's nice to dream' list: Arnold Schwarzenegger, Hugh Jackman, Robert Downey, Jr., Jennifer Lawrence, Samuel L. Jackson, Scarlett Johansson, Chris Evans, Chris Hemsworth, Gal Gadot, Tom Cruise and Tom Hanks