Seems interesting so far! I do have a few comments/suggestions regarding the beginning parts:
I do feel as though the retelling of the legend is perhaps a bit too long for what it is, 5 pages (PG4 is listed twice xD). I think part of that is because it tells kind of 2 separate history arcs:
Creation -> Demon Alien (or wev) -> Prince/King slays them and brings peace
and then
King goes mad -> new war/conflict -> resolves and new Queen takes the throne, peace again.
I feel like a lot of similar history retellings in stories that I've read do like.. 1 arc. Like some Zelda games do this, where it's like:
Hyrule at peace -> Ganon shows up -> hero of legends smacks him down -> Peace
So, I have a few suggestions:
- Keep the same amount of content, but maybe try to distill it down to 3 or so pages?
- See if there's maybe a way to simplify the retelling of history down to a shorter form: typically there's more to the story than the legend that the elders actually pass along, be it because parts got lost or distorted over time, or simply they found an idealized way of telling it.
- Another thing to consider might to be to make the prologue a little longer actually, and play out some of those key scenes as they actually happened. The main reason to do this would be to provide readers with an immediate hook, show them some cool action to get them interested right away :] I think if you did this maybe everything up to right before the demon alien guy would maybe be told the same way as currently, and then from there you introduce the historic characters and kind of show that confrontation in realtime, then a brief time skip to where the king goes crazy, then play out one or two of those key scenes, then at the very end fade back to the scene on the train. Especially if some of these characters become relevant later on in the story, having them shown beyond simple snapshots can help them stay relevant in the reader's memory.
Granted, the above can be dangerous too, because if the prologue becomes too long that's its own issue xD if that approach was taken careful editing for length would have to be done, but I could see it being a "full length chapter" at like 20 pages.
- Regarding the beginning of Chapter 1
I love Flare's retelling of the past week followed by "You know, typical vacation stuff"! xD Reminds me a lot of Rick Riordan's YA novels (ala Percy Jackson, etc.) which I'm a big fan of. The one thing about that first panel though of Chapter 1 is again, it feels like too much is happening in too short of space. Like reading all the stuff that happened in the past week, sounds awesome! But then it feels like we kinda get cheated out of it since the story just picks up right away from after all of that. At the very least I think each event warrants its own panel, maybe. Along the lines of:
Panel 1: It's been a week since I met that old dragon (Picture: What's happening right now, the fight with the cargo)
Panel 2: Since then, I found out that dragons have been going missing in this town, among other weird hings happening around here (Picture: something related to the missing persons, maybe a detective or crying families or idk).
Panel 3: fought a spider, bat, and a wolf monster (Picture: maybe a panel split in 3 showing a snippet of each fight)
Panel 4: Had a bounty place on my head (Picture: maybe show flare evading the authorities)
Panel 5: unwillingly made some new “friends”, and found out that I and those friends were chosen by Queen Windetta herself to be partnered with ancient elemental spirits, (picture: maybe show the friends, with a follow up of the queen and/or elemental spirits)
Panel 6: gained some (honestly) pretty sweet armor and powers, (Picture of armor and powers)
Panel 7: and learned to pilot giant robots, All to be inducted into a war against some long thought dead warlord and his
army of science experiments gone wrong.
Panel 8: PNL 2: We then see Flare giving orders to the rest of his team as they charge into battle.
Flare (V.O.)
So yeah, basic vacation stuff...
That's like minimum 2 pages worth of content crammed into a single panel at the moment xD or at least from a reader's perspective, that's kind of how it feels. And even after separating it out some it still feels like just a ton of super different things happening in a short amount of time. I'm not sure if maybe a future chapter will cover these details in more depth? If so my above suggestion might not be that necessary, but I would probably also try to edit down that block of text some in that case. I think when you go to thumbnail the page you'll have a lot of trouble trying to fit that much text into a single panel, even if it's a full page panel.
It seems like the pacing smooths out a lot after you get past the introductory stuff! The fight scene seems pretty cool and will be fun to see drawn 
So, in short, I like the premise a lot! But I do think the beginning (both prologue and start of Ch1) could use some work, both to hook readers as soon as they pick up your story, as well as to ease them into your world a little more gently. There's a lot of good content there but the sheer mass of world building and skipped events kind of hit you like a truck as you're crossing the road to the good stuff xD Can't wait to see it realized though! After seeing a lot of your char designs for it around the forums, I'm pumped to start reading
