I can't believe it... Please tell me everything about Alpha
As of Chapter 41, Alpha managed to attain the [Crown] and become a Phylotree's Sefirah, being designated as Keter. In doing so, she ended up becoming a higher-dimensional being, who longer existed in the unvierse, she is regarded as an Overseer, or a guider of civilization (in CN), through the Phylotree of Ousia, her gaze extends to all universes across the past, present, and future, her role as an Overseer is to provide humanity with the tools to advance significantly so they can establish links to the Phylotree of Ousia in order to extract more [Sefirah], and presumably those who became [Sefirah] will reach the same state of existence as Alpha, additionally, Alpha herself is pretty unique due to absorbing all of the negative emotions of every universe, she ended up up corrupting the [Crown] and literally causing it to become an [Inverse Sefirah] transforming it into [Atheism], which is designated as Thaumiel, additionally, it's been revealed that the Ascension-Network represents the Qlippoth/Tree of Death, which is why Alpha was shown to redefine it and grant Luna full access to it, alongside a mere projection of herself manifesting and being on the level of an Agent at the bare-minimum with her energy levels rapidly exceeding that. Furthermore, Alpha has the ability to access the Gateway completely, she reached this plane of existence, interacted with Ishmael, and is heavily implied to be able to pass through the Gateway and fight a being from beyond it, which also ties into the reveal on all of the [Sefirot] specifically their mediums (not their divine essences that are etched into the Phylotree) all come from anaylzing data from the Hetero Tower's core, and as such they essentially function as personalized Agent Zeros, which should be sufficient for the AZ Authority requirement that becoming an Observer typically needs, furthermore the Forbidden Fruit PV that was released a long time ago told us that all the [Sefirot] when assembled can open the path to the Gateway, which tracks with Alpha who could casually do this, especially since at the time she was [Crown] who holds the highest position on the Phylotree of Ousia, and of course can do so as [Atheism] who's still the highest, but on its reverse and opposing scheme. Her abilities are pretty ridiculous she's able to prune universes and anchor a specific one that becomes the definitive one while all others perish, she can manipulate causality and fate, see every single universe across the past, present, and future with her mere gaze, can reverse time, stop time, and travel through it being able to go to the Pre-Reset Timeline to interact with Vonnegut while using SKK as an anchor point, she can effortessly manipulate and tear through the Fog casually alongside being able to absorb it into her M.I.N.D. which is stated to be the Phylotree of Ousia itself, and finally, I've saved the best for last because it's genuinely absurd, due to Alpha having devoured all the fruits (the [Sefirot]) of the Phylotree she actually inherits all of their authorties which is expected of Keter, so for every [Sefirah] that appears in the storyline and shows off something impressive like Liv for example with [Mercy] it's an automatic upscale for Alpha, considering that she is [Atheism] though and Kuro revealed that the Sefirah vs Qlippoth ordeal in the storyline is happening, all of her authorities have became [Inverse Sefirah] to go in hand with her position as Thaumiel which has full dominance over the opposite scheme, so in either case Alpha is getting massive upscales in the foreseeable future.
With that said, as an Overseer Alpha isn't actually bound by any of the "rules" Ishmael or Nanami are, since her whole "rebelling against fate" thing is literally weaponized to counteract the "rules", so she can actually freely utilize her higher-dimensional powers to assist humanity, but there is a cost, and that's the Law of Conservation, for every thing Alpha does that impacts civilization, a counter will form in response to it. For example, Alpha gave humanity her cosmic knowledge of the Phylotree of Ousia and what it does, while this is good, this does give our enemies a significant advantage, and more importantly the Cosmic Filtering that Helentine notes to be sending brand new adversaries against us, since humanity will evolve significantly, and we learned that the Master of the Punishing Virus will select a new Agent, so there's a lot in store for the future of the story. Ranking-wise, I would place an Overseer and the [Sefirot] (when they are fully metamorphosized) as being just below the Observers and Nanami (discounting their ability to become Observers from the equation), since they're literally just junior Observers that have the ability to ascend higher.