The setting look a bit too vague to pronounce myself now but I’m interested. I’ve made, some question and would be happy if you took time to answer them 
Even tough you will probably answer most of them during chapter 1, or some will be answered latter while we progress in the plot.
Questions
I wonder, when will we arrive on Earth ? On the modern era ? Medieval ? At the start of the industrial revolution ? Slightly in the futur ? Prehistory maybe ? And how long would the game cover ? A few years ? A decade ? A century ? Almost all of human history (and we’re the reason for mythology and the idea of magic) ?
And how are the Axenian physically ? Are they human looking or do they have a slightly more alien physiology (like Asari) but still in the realm of humanoid ? Do they look totally different from a human like the Hanari in Mass Effect ?
How much do the 5 soldiers have knowledge of humanity and what kind ? Do they know a lot about the scholar part of humanity but are lacking knowledge of everyday life and normal comportement ? The reverse ? Or a healthy balance of both ?
Does the 5 soldiers start at the same place and act as a group or they’re scattered across the world ? Do they even know each other ?
And my question for the rules. First of all, which is the most important one ? The first or the second ? Because I see how the both of them can easily clash.
The first rule : To what scale must we protect humanity ?
-Totally, avoid every casualties possible.
-Stop the event that would create lots of casualty but if one or two human go squick, it’s ok.
-Just make sure that the species is not at risk of infection. If only one or two million is left you’re still in your quota.
Second rule : What exactly must we not reveal ?
-The fact that we are an alien ?
-The fact that we have superpower ?
-Or both ?
And will it be a story where our protagonist struggle to reach at least a bittersweet ending, his morality and loyalty constanty tested as he advance unsure of himself ? Or will it be lighter story, an adventure full of danger where we will fight with all of our Might but and happy ending ?
Or in this universe, the future is bleak and hope is a meaningless word ? It’s kill or be killed, and the only one on who you can count is yourself ? Would the human even accept to cohabit with axenian ? And do the latter see the former as nothing more than future slave ?
And I’m sure that creating a cover by marrying a human, taking care of them and having offspring with them pretty much don’t break rule 3. For the sake of the mission and rule 2. Don’t thank me, I’m only doing my duty. Now to find a gift for them…
you sure you want to make that your pic your representation.