Marcus Flint played by Jake T. Austin.
Edward Nott played by Liam Neeson.
Charlie Weasley played by Sam Heughan.
(The images aren't downloaded for me at the moment. I will upload them once I can get them to transfer in. For now, I hope you don't mind searching up photos if you are unsure as to who the castings are)
Just a note: Grindlewald will be involved in this story. He is already cast in the movies, but I have decided to not cast him differently, but just to point out that the Grindlewald I write is most similar to Johnny Depp's portrayal of the man. Feel free to cast whoever you would like as the Dark Wizard, but keep in mind that that is who I was picturing when writing.