I've only added four new names in the last two years, but with Shirley Henderson and Evanna Lynch within a couple of weeks of each other it seemed as good a time as any. Harry Melling has increased his lead as the Potter actor I've seen on stage most times - which just goes to show how much theatre he does, considering I collected my first two cast members (Sophie Thompson and Mark Williams in the same production of As You Like It) in the year he was born.
I'm using the Wikipedia cast list, which also includes actors whose entire performance ended up on the cutting room floor. I've linked to my reviews of the shows where possible; any title that isn't a link means it's from before I started reviewing online.
1 - Daniel Radcliffe (Harry Potter) - Equus, How to Succeed in Business Without Really Trying, The Cripple of Inishmaan, Rosencrantz and Guildenstern Are Dead.
2 - Rupert Grint (Ron Weasley) - Mojo.
3 - Carolyn Pickles (Charity Burbage) - Fram.
4 -Alfred Burke (Armando Dippet) - Oedipus.
5 - Michael Gambon (Albus Dumbledore) - Volpone, Henry IV Parts 1 & 2, No Man's Land, Krapp's Last Tape, All That Fall.
6 - Toby Regbo (Young Albus Dumbledore) - Tusk Tusk.
7 - David Bradley (Argus Filch) - Henry IV Parts 1 & 2, No Man's Land, Moonlight.
8 - Warwick Davis (Filius Flitwick) - See How They Run.
9 - Zoë Wanamaker (Rolanda Hooch) - The Glass Menagerie, Much Ado About Nothing, All My Sons, The Cherry Orchard, Passion Play, Stevie, Elegy.
10 - Kenneth Branagh (Gilderoy Lockhart) - Ivanov, The Winter's Tale, Harlequinade, The Painkiller, The Entertainer.
11 - Maggie Smith (Minerva McGonagall) - The Lady In The Van.
12 - Gemma Jones (Poppy Pomfrey) - Richard III, The Turn of the Screw, The Rivals.
13 - Ian Hart - (Quirinus Quirrell) - Three More Sleepless Nights, Speaking In Tongues.
14 - Jim Broadbent (Horace Slughorn) - Theatre of Blood.
15 - Miriam Margolyes (Pomona Sprout) - Wicked, Endgame.
16 - Emma Thompson (Sybill Trelawney) - Sweeney Todd.
17 - Georgina Leonidas (Katie Bell) - That Face.
18 - Jessie Cave (Lavender Brown) - Arcadia, Mary Rose.
19 - Katie Leung (Cho Chang) - Wild Swans, The World of Extreme Happiness, You For Me For You, The Intelligent Homosexual's Guide to Capitalism and Socialism with a Key to the Scriptures, Snow in Midsummer.
20 - Hugh Mitchell (Colin Creevey) - Arcadia.
21 - Henry Lloyd-Hughes (Roger Davies) - Punk Rock, Rope, Posh, Tiger Country, The Changeling, NSFW.
22 - Isabella Laughland (Leanne) - Greenland, Wanderlust, The Last of the Haussmans, Hard Feelings, The Same Deep Water As Me.
23 - Matthew Lewis (Neville Longbottom) - Our Boys, Unfaithful.
24 - Evanna Lynch (Luna Lovegood) - Disco Pigs.
25 - Alfred Enoch (Dean Thomas) - Happy New, Antigone, Timon of Athens, Coriolanus.
26 - Bonnie Wright (Ginnie Weasley) - The Moment of Truth.
27 - Sean Biggerstaff (Oliver Wood) - Right Now.
28 - David Brett (Dedalus Diggle) - The Four Stages of Cruelty, Outward Bound, The Cabinet of Dr. Caligari, Moby-Dick, Stony Broke in No-Man's Land.
29 - Ciarán Hinds (Aberforth Dumbledore) - Burnt by the Sun, Juno and the Paycock, The Night Alive, Hamlet, Girl From The North Country.
30 - Kathryn Hunter (Arabella Figg) - Fragments, Kafka's Monkey, Antony and Cleopatra, Tell Them That I Am Young and Beautiful, The Bee, A Tender Thing, Mare Rider, The Valley of Astonishment, The Emperor.
31 - James Utechin (Young Remus Lupin) - THE HORROR! THE HORROR!.
32 - Adrian Rawlins (James Potter) - The Herd, 3 Winters.
33 - Robbie Jarvis (Young James Potter) - Shivered.
34 - Geraldine Somerville (Lily Potter) - Serenading Louie.
35 - George Harris (Kingsley Shacklebolt) - Frankenstein.
36 - Mark Williams (Arthur Weasley) - As You Like It.
37 - Domhnall Gleeson (Bill Weasley) - The Lieutenant of Inishmore, Now or Later.
38 - Julie Walters (Molly Weasley) - The Last of the Haussmans.
39 - Richard Bremmer (Lord Voldemort) - The Starry Messenger, The Last Days of Troy.
40 - Ralph Fiennes (Lord Voldemort) - God of Carnage, Oedipus, The Tempest, Man and Superman, The Master
41 - Suzie Toase (Alecto Carrow) - Talent, One Man Two Guvnors.
42 - Ralph Ineson (Amycus Carrow) - Hangmen.
43 - David Tennant (Barty Crouch Jr) - What the Butler Saw, Much Ado About Nothing, Richard II, Don Juan in Soho.
44 - Jason Isaacs (Lucius Malfoy) - The Dumb Waiter.
45 - Helen McCrory (Narcissa Malfoy) - The Seagull, Rosmersholm, The Late Middle Classes, The Last of the Haussmans, Medea, The Deep Blue Sea.
46 - Timothy Spall (Peter Pettigrew) - The Caretaker.
47 - Nick Moran (Scabior) - Twelve Angry Men, Roaring Trade.
48 - Sian Thomas (Amelia Bones) - Fram, Spring Awakening, Britannicus, Blue Heart Afternoon, Passion Play, Eldorado, The Trial, Welcome Home, Captain Fox!, Platinum.
49 - Kate Fleetwood (Mary Cattermole) - Champagne and Kippers, Medea, Macbeth, Life Is A Dream, London Road, Our New Girl, King Lear, High Society, Medea (2015,) Bug, Ugly Lies the Bone.
50 - Steffan Rhodri - (Reg Cattermole) - Clybourne Park, The Kitchen Sink, Posh, A Mad World My Masters, Candide, I'd Rather Goya Robbed Me Of My Sleep Than Some Other Arsehole, Light Shining in Buckinghamshire, The Mentalists, The Hairy Ape, Woyzeck.
51 - Roger Lloyd-Pack (Barty Crouch Sr) - When We Are Married, Dealer's Choice, Twelfth Night, Richard III.
52 - Jeff Rawle (Amos Diggory) - Fram, The Power of Yes, Hymn and Cocktail Sticks, Handbagged, High Society, Lawrence After Arabia, Raising Martha.
53 - Jessica Hynes (Mafalda Hopkirk - voice) - The Norman Conquests.
54 - Sophie Thompson (Mafalda Hopkirk) - As You Like It, Clybourne Park, She Stoops to Conquer, The Physicists, Guys and Dolls.
55 - Bill Nighy (Rufus Scrimgeour) - The Seagull, Skylight.
56 - Guy Henry (Pius Thicknesse) - King John, Twelfth Night, Wendy and Peter Pan.
57 - Imelda Staunton (Dolores Umbridge) - Entertaining Mr Sloane, Sweeney Todd, Circle Mirror Transformation, Good People, Gypsy, Who's Afraid of Virginia Woolf?.
58 - Amelda Brown (Mrs. Cole) - Adler & Gibb.
59 - Harry Melling (Dudley Dursley) - Mother Courage and her Children, Women Beware Women, The School for Scandal, When Did You Last See My Mother?, The Starry Messenger, I Am a Camera, The Hothouse, peddling, The Angry Brigade, Hand to God, King Lear, Jam.
60 - Fiona Shaw (Petunia Dursley) - Medea, Mother Courage and her Children, London Assurance, Scenes From An Execution, The Rime of the Ancient Mariner, The Testament of Mary.
61 - Richard Griffiths (Vernon Dursley) - The History Boys, Equus, The Habit of Art, The Sunshine Boys.
62 - Ian Kelly (Mr Granger) - The Pitmen Painters, Mr Foote's Other Leg.
63 - Michelle Fairley (Mrs Granger) - Greta Garbo Came to Donegal, Huis Clos, Splendour, Road.
64 - Jim Norton (Mr Mason) - The Veil, The Night Alive, Hamlet, Girl From The North Country.
65 - Jamie Campbell Bower (Young Gellert Grindewald) - Bend It Like Beckham.
66 - Frances de la Tour (Olympe Maxime) - The History Boys, The Habit of Art, People.
67 - Dawn French (The Fat Lady) - When We Are Married, Thirty Million Minutes.
68 - Kelly Macdonald (The Grey Lady) - Hurlyburly.
69 - Shirley Henderson (Moaning Myrtle) - Girl From The North Country.
70 - John Atterbury (Phineas Nigellus Black) - Ivanov.
71 - Rhys Ifans (Xenophilius Lovegood) - Under Milk Wood, Volpone, Protest Song, King Lear.
72 - Lee Ingleby (Stan Shunpike) - Our Class.
73 - Miranda Richardson (Rita Skeeter) - Grasses of a Thousand Colours.
74 - Paul Ritter (Eldred Worple) - The Norman Conquests, The Curious Incident of the Dog in the Night-Time, The Audience, "Art".
75 - Julian Glover (Aragog - voice) - The Scottsboro Boys.
76 - Toby Jones (Dobby - voice) - The Play What I Wrote, Parlour Song, The Painter, Circle Mirror Transformation.
77 - Ray Fearon (Firenze - voice) - Julius Caesar, Hecuba, Macbeth.
78 - Simon McBurney (Kreacher - voice) - Measure for Measure, Endgame, The Encounter.
79 - Michael Wildman (Magorian) - Hamlet, Welcome to Thebes.
80 - Lenny Henry (Shrunken Head - voice) - The Comedy of Errors, Fences, The Resistible Rise of Arturo Ui.