Well, let#s take this into a different direction: What characters actually DO we have in the Fall of Gondolin?
Main Characters: This is easy, we basically have
-Earendil
-Idril
-Maeglin
-Tuor
-Turgon
Secondary Characters, again this is easy, these do appear in the story and do play some important part:
-Annael, Tuor's elvish adoptive father, should appear in early Hithlum/Mithrim
-Gothmog, one of the War-Leaders at the fall of Gondolin
-Morgoth/Sauron , tortures and corrupts Maeglin (and some others?) - do we use Morgoth or Sauron here, or both?
-Ulmo , gives Tuor orders to go to Gondolin
-Voronwe , Tuors buddy
Now comes the more tricky part, which characters we MIGHT want to use or emphasize on as Support...
Support Characters, I do propose:
-Ecthelion - should appear at Turgon's court as an important official
-Glorfindel - should also play a major role at Turgon#s court
-Meleth - she#s Earendil#s Nurse and probably a friend of Idril#s
-Lorgan - drives Tuor and the Sindar out of Hithlum, should make an appearance in the early stage of the movie
-Rian - Tuors mother, might appear in an early scene, when Tuor is found and brought up by Annaels Elves
-Salgant/Talagand - is mentioned as a co-conspirator of Maeglins , a coward but also as a friendly uncle-like figure to Earendil. This character could actually become quite interesting!
-Thorondor , King of Eagles. Should play a more or less prominent part in the story.
Now optional characters, characters we may want to appear or play some part, but a small part only. They don#t even necessary need to have lines, they might just be outstanding extras (Figwits):
Turgons Paladins:
-Duilin - head of the house of the swallow
-Egalmoth - head of the house of the heavenly arch
-Elemmakil - captain of the guard of gondolin
-Galdor - head of the house of the tree
-Penlodh - hwad of two houses of Gondolin
-Rôg - head of the house of the hammer of wrath
I guess Elemmakil has a little dialogue, i don#t know if the others would have, but they definitely should appear as members of Turgon#s court and council. Especially Rog is interesting... his name is orcish, i always imagined him a rugged veteran and former prisoner of Angband who is known by the orcish nickname he got there... but that#s just my personal headcanon.
other Gondolindrim:
-Aranwe , he#s Voronwe#s dad ands possibly a noble of Gondolin. We may show the short reunion of father and son - or we consider Aranwe dead at the point. However Aranwe could be interesting, his -we name suggests he might be a very ancient elf, possibly one of the first or secondborn of Cuivienen, his aran- name suggests he is a very close kinsman of the noldo-Rayal line. So we could flesh him out if we wish to...
-Celebrimbor, peooply don't think about this too much but actually a young Celebrimbor at this point may have lived at Gondolin at the time as he was a pupil of Gondolin#äs Master-smith Enerdhil, so he might be present as a young member of Turgon#s court.
-Enerdhil , Gondolin#s genius-Smith. doesn#t need a dialogue, but might be shown as a working collreague/teacher to Tuor and maybe Earendil?
-Hendor , a House-Carl of Idril#s who assists at the escape from Gondolin. This character actually might be intreresting, we could flesh him out a bit and give him some lines...
-Legolas - a young scout. Do we make this Legolas the same as LotR Legolas? I don't think we have to do this, he just could be a namesake, as this Legolas seeems to be a Noldo and we have never heard that members of Thranduils Family lived at gondolin at the time.
-Littleheart - he#s Voronwe#s son, so actually a young Littleheart MIGHT appear in the movie. Maybe Voronwe met his wife at Gondolin, just as Tuor did and Ilfrin and young Earendil were playing comrades?
-Pengolodh, the famous Loremaster of Gondolin. He should appear as a prominent extra at Turgonäs court, we might give him some dialogue if we want to
Bad guys:
-Balcmeg
-Lug
-Othrod
-Orcobal
the four Orc-Chiefs slain or mutilated at Gondolin. I guess we use them in the same way PJ used his Boss-Orcs in his movies..
-"The Beast of Gondolin" - a terrible dragon, possibly spawn of Glaurung
-The Other Balrog - at least one other Balrog dies at Gondolin
We should decide if we want to give the bad guys some greater dialogue or not, if yes here we have quite a good ensemble of lesser support characters for a few lines.
others:
-Arminas & Gelmir - two elven ambassadors Tuor and Voronwe meet on their travel... if we wish to use the scene!
-Túrin - Tuora kinsman whom he sees for a second from afar - if we want to use this scene!
-Treebeard - people forget about this but Treebeart and Wandlimb live in Nan Tathren at the time, so if we do show the part of the story in which the gondolin refugees arrive at Nan Tathren there#s quite some chance they meet the ents!