[@MagusDream]

As an aside, I know from experience that if this RP has any one fault, it's that the same free-form freedom that makes character creation, backstory flexibility and worldbuilding so great also has the downside that there's honestly very little established about the world directly other than the primary location of the RP, the city of Rhea.

So, this RP’s world-building can be summarized as Not!semi-modern irl countries + Magic: YES. It’s a very free-form setting that can be hard to wrap your head around when first diving in, mostly because there’s always something new to discover, especially when a new player joins up. It hasn’t really absolutely stabilized into any one thing beyond those parameters, which leaves it incredibly flexible to most exotic backstories. For the most part, Rhea (the independent super-city the RP is based in) is the most technologically and magically advanced society in the lands and has no real IRL country equivalent. Other lands vary in modernity, with the likes of Vauquelin effectively being stuck in the post French Revolution (the equivalent of which occurred 3 years ago).

So, there’s definitely some mixing of eras in this RP.
Part of that is that the only place the GMs really directly fleshed out personally is Rhea and some of the broad world lore. Everything else? The players. We’ve been essentially collaborating on the lore.

GM(s) did -and still continue to expand upon- the independent Supercity, Rhea.
Dezual did Vauquelin (Not!France)
Letter Bee did Izumo (Not!Japan)
Pariel did a bit of Albion (Not!Britain)
Crowvette did Yekaterina (Not!Russia)
Instead of an (Earth) country, I did a lot of the lore for Demons and fleshed out a bit of the Gods and Great Evil history.
Just as some examples.

I lead with this context to preface that this RP's setting is most definitely not Earth.
So, in regards to your character's setup, for all intents and purposes, neither Greece or the Greek Gods/Pantheon/Myth exist. Certainly, for your backstory, you can absolutely conjure up and flesh out a bit of what would then effectively be the Not!Greece of the RP, but we aren't dealing with an Earth setting. Also, in regards to Lambda's godly patron, as the Greek Gods don't exist, neither do the Titans.

Gods in this setting are one and all living fundamental aspects of reality. The death of even a single one would devastate their entire domain of reality. As such, any and all potential lore reliant on or involving the deaths of gods is kinda nonviable. And the Greek lore is definitely such. Also, most gods are a little more specific/narrow in their domains. A singular god that has domains over stars, planets and astrology is a bit of a stretch, and you really lose basically nothing by merely having him be the God of Astrology or God of Stars alone.

Anyway, let's get to the powers.

Character approval generally goes through a bit of a "trial by fire" 'round these here parts, as the Discord server sits in a circle, looming ominously over potential incomers. Which is to say, GMs and fellow players alike usually have a bit of voice in what looks reasonable. That said, let's get to it. We'll handle the easy stuff first.

[b]Sub-2: Stardust flight[/b]
The only real gripes seem to be that it might be a little out of place with his theme, but overall, mechanically, this ability almost trivially got a pass, enough that it didn't even provoke mentioning except as an afterthought.

[b]Sub-3: Starlight Healing[/b]
The description and listed feats are incongruent. If you could clarify what this ability can actually do in a bit more detail, it would likely go by without issue. We have some pretty strong healers, but you were indeed correct to assume that actual resurrection would likely not be viable. In short, if you could list out a couple of the most severe things he could treat (physically and spiritually), instead of the minor stuff, that should get this a pass.

[b]Magic Item: Astral Bearer[/b]
There were a number of concerns with this, namely because the flowery description implied some potentially crazy capabilities. However, a closer look seems to say this is merely intended to allow Lambda to cast his magic during the day, when it normally could only work at night. If that's the case, then this is an easy pass. Although, for clarification's sake, some pertinent questions would be: What would happen if this thing were broken? And does it provide any other benefits other than allowing casting/star communication during daytime?

Now, we get to the actually troublesome bits.

[b]Demigod:[/b]
So, you want to play a demigod? Sure. Great even! Given the flexibility of the setting, your method of his semi-ascension is viable. You're actually the first one to take this route. However, it should be noted, unless you specifically dedicate a power slot to it, being a demigod will not provide him any tangible benefits beyond flavor. He should still operate within generally human limitations physically and such otherwise. We weren't sure what you were intending for this, but this is just to clarify.

[b]Sub-1: Wish Granting[/b]
So, to say the least, this was not received all that well. The general consensus was not just "hell no", but (to quote the main GM, STK) [i]"Hell to the no, to the no no noooo"[/i]. As written, this power has way too much room for abuse and misuse, no matter the character's personality or intentions. We've tossed around potential limits to add, but in the end, it was really only decided that this either needed to go entirely or be narrowed down into a far more specific and/or crippled wish power. It's hard to say what the final result could be, however, without asking you directly. So, before we go any further, what are you hoping for the character to do with this kind of power?

[b]Core: Wishes of the Stars[/b]
We've already established that Gods from Earth mythology aren't possible, which means this needs rewording. This also says he can "Generate Stars"...? Did I read that right? If that's as literal as it sounds, it's probably getting noped. Aside from those bits, this power is fine. However, it was noted that this doesn't really feel like an actual "Core" power that all the sub-powers branch off of. Granted, his "star child" theme is pretty clear across the board, but this power doesn't really mesh with the flight or healing. If I were to suggest anything, I'd actually say to make this Core power to be his Demigodhood outright and have everything else branch off of that. Something like: [b]Core Power - Demigod of the Stars[/b] would be far more flexible and not leave the overall powerset feeling so janky.

Anyway, that's pretty much it on the powers end. I'm sure I've missed a thing or two, but this was the major stuff that bore mentioning first. His backstory may potentially need some adjustment (there were questions about that whole "abandoned infant" thing and the fact that a full-on GOD is just walking around in the mortal realm). In the case of the latter, given what I've just told you about the nature of gods in this setting, you might be able to see where that could be a problem, and the need for an Avatar or something might be pertinent, depending. Just a thought. Overall, however, besides being a bit on the "pushing it" side of exotic, his backstory is generally fine.