You could easily fill a second Wave. Just on the top of my head: Lockhart, Greyback, Bellatrix, Lucius Malfoy, Narzissa Malfoy, Teenager Malfoy, Justin Finch-Fletchley, Alicia Spinnet, Katie Bell, Angelina Johnson, Dolohov, Crabbe and Goyle, Pavarti, Lavender, Fudge, Sirius, Kingsley, The Dursleys, Other Houseghosts, Seamus Finnegan, A generic Deatheater, Hufflepuff and Ravenclaw Quidditch Players, Prof. Sprout, Mr. Weasly, Mrs Weasly, Percy, Bill, Charlie, Fred, George, Ginny, Wormtail, Fleur, Krumm, Griphook, Nicolas Flamell, Nagini (human form), Tonks, Cormac Mclaggan, Earny Shumpike, younger Tom Riddle, Myrthe, the Carrows, the Snatcher, Rita Skeeter, Scrimgour, Xenophilius Lovegood, Aberforth Dumbledore, Mundungus Fletcher and Kreacher. (plus Book-only Characters like Ludo Bagman, Peeves or Prof. Binns, but i doubt that)