Twist of the game idea.

Have a new Charr race and/or Tenu race. You play with them through their side of the story. Fight and try destroy the humans. Ramsack their villages/settlements. Each mission we already have could be re-worked in such a way that they have to travel the long distance to to Port Sledge. Develop a story side on why their there and what they are up to. Could do lots with this.

They might do this in the expansions. But seeing as how the current Chapter 1 covers all aspects of the story so lightly (as an introduction?), the expansions will assumedly concentrate more on the specific parts, e.g. what happened to Ascalon and the Charr, what happened to Kryta and the White Mantle, what's going on in Cantha, etc.

That would really only be good in one of the following ways:
1) A single-player expansion
2) A separate game
3) Set in an alternate universe

Why? Because winning the Charr side and winning the human side would contradict eachother. Simple as that. I like the idea, though, it'd be fun to play as another race.

EDIT: Of course, just as I posted, I had an idea.
Why not make it so that we can play a character of another race from the beginning of the game? It would be similar to this idea, but instead of being on that race's side, you could be a rogue creature and fight alongside the humans! Wouldn't that be cool?

I think that rather than having Charr as a playable race, you should be able to play as Dwarves and Caromi (It's not Tengu, it's Caromi, Tengu is a type of Caromi) I don't know about having a storyline, I was jstu thinking how cool it would be to play as them in PVP. But a storyline could work, but definetly not Charr, I could understand expanding on the whole Charr-Humans thing, but not playing as the Charr.

If, however, you were able to play as the Charr, it wouldn't be so you would win against the humans, but how you conquered them pre-searing, then moved in, and lost, and then struggled for survival..?

I think it'd be cool to start a new Charr character in Pre-Searing and go around killing humans for XP

Another idea, then there would be the possibility of Human VS Charr PVP!

Because you only see what the game gives you and not what it gives other people, I think showing the Charr side of the searing would work. For instance, in The Great Northern Wall, you could be an undercover scout Charr that was lost. You wander back to your camp to find a small group of humans sneaking up on it. You call out and your camp joins you in the chase back to the wall.

I seriously love the Avicara... I would be thrilled to have an expansion or update that lets us find their cities (they are advanced, they must have cities) and mingle with their culture.

edit: regarding tengu and caromi, they are all relatives of Avicara though Caromi is slightly more barbaric and Tengu are like a minor tribe