MithLuin asked how we can introduce Ecthelion.
Any reason we can’t include Ecthelion and Glorfindel among Turgon’s people? Why would being among his people at Nevrast be a bad place to introduce them?
Certainly, Ecthelion and Glorfindel (and some other more minor characters) will be with Turgon at Nevrast.
What I am asking for is an introduction scene/plot point/story, not just where in the timeline they will appear.
As a 'for instance' - Glorfindel's introduction in Lord of the Rings
is the moment when he saves Frodo and company in the flight to the Ford of Bruinen. It's a moment that really emphasizes how Glorfindel is a unique elf, able to face the Nazgul directly. The audience is immediately taken in by how awesome he is. It's a great intro (and then of course he does nothing else for the rest of the story, which is...maybe not...how these things...usually...go).
We absolutely can introduce Ecthelion as the person who is arranging the event planning for the Mereth Aderthad and getting Nevrast ready for the party.
But...we almost definitely don't want to do that.
We want to think about the scene that will introduce Ecthelion and what it will tell the audience about him. There should be something central to his character (or future destiny) in that scene.
TV show character introductions don't have to all be overly dramatic and impressive. But they should be in some way memorable.
Edited to add:
Example TV character intro: Charlie on Supernatural
This 1 minute intro at the beginning of the episode lets us see and form an impression of the new character Charlie (played by Felicia Day). There is no dialogue, but we quickly learn that she is a quirky/unconventional type - she rides a bright yellow moped to work; she has a geeky 'rebel' Princess Leia t-shirt instead of conservative office clothes; she rocks out to her ipod on the company elevator. And it doesn't take much to figure out that the episode title 'The Girl with the Dungeons and Dragon Tattoo' probably refers to her. So, there's lots of 'character' moments there, but most of her actions (plot) emphasizes the security of the place where she works; she needs a key card to get in the building and to use the elevator, and there are security guards watching her photo ID pop up on their screens as she passes. Clearly, she is going to be a key character if some outsider wanted to sneak into the RRE headquarters....
I'm not asking us to come up with the precise intro scene we want for Ecthelion yet. I'm asking us to come up with a plotline where he does something significant/key, so we can craft an intro in that context. If Ecthelion were Charlie, I would want us to come up with 'we can use her to break into RRE, showing off her tech skills.' So, yes, I know he's practically Turgon's right-hand man, and is thus heavily involved in the construction of Vinyamar and Gondolin, and likely helps rule Nevrast. But...what does he *do*? Is he a key player in the Sindar coming to live in Nevrast? If so, how/why? Having him captured/escape Angband is a storyline that gives him a role in the story - he would come back with intel about what Morgoth and Sauron are up to. Part of the issue is that we want the audience to see him and Glorfindel as awesome fighters...so at some point in this first season where he's more than a background extra without lines, we need to show