Axis has a very bland who's who summarizing themselves as the (Greater Planar Plane, not with a deity-shaped concentration of quintessence) Power of Pure Law, responsible for maintaining order throughout the multiverse by balancing the interests of various powers. According to them, Heaven and Hell are at least fairly sane, though both distracted by their moral commitments (Heaven's are friendship and kindness and such, Hell's are making sure that everyone occupies the appropriate posture of terrified submission to Lord Asmodeus) enough that they won't coordinate with Axis on conquering the universe and dividing it into Axis-supervised Heaven and Hell patches based on their compared military strengths. The rest of the Upper Planes are … at least sort of vaguely kept in line or at least documented by Heaven, which makes fighting them not a priority even if some of them would be so Chaotic as to disrupt signage in order to rescue slaves. Proteans and the Abyss are Chaotic and have no Heavenly protectors, so Axis is at war with both of them. Abaddon, the plane run by the Horsemen of War, Plague, Famine, and Death, is at least not as insane as the Abyss and can at least sort of keep to treaties, so its interests do get reflected in them, though they really don't have the best track record of keeping to treaties, which is why the treaties are often revised to penalize them.
The broad themes of Hell's public-oriented documents are oriented towards "immediate, total compliance is the torture-minimizing option" and "working with Hell will get you the power-over-others and recognition you deserve", oozing with the message that compliance with Lord Asmodeus is what any reasonable agent would do. According to Hell: Axis is an admirable example of Law second only to Asmodeus. While they seem to be missing out on the ethical aspects, they've already agreed to immediately surrender and be brought in line with Asmodeus's vision when his absolute authority becomes clearer. Abaddon has little to offer, being a plane of omnicide. The Abyss is a disordered cancer which would run much better under Asmodeus's rule, and the Maelstrom is pure insanity of no worth. The Upper Planes treat their servants with far too light a hand, due to their insane values which will lead them to failure. The Archons are, at least, capable of some basic understanding of Law, while the Azatas lack even that.
Public documentation from Abaddon is sparse, ranging from "Life is a lie that Charon will mercifully shatter. The other planes perpetuate it and they will, like everything else, die.", to praise of war and advice that one get help from Szuriel the Horseman of War with it, promotion of dangerous fasting, glorification of disease, and some confusing promotion of a ritual that involves killing a lot of people to become an undying skeletal spellcaster.
Bar does not offer many publications from the Abyss, as distributing documents in a language you have to be insane to read doesn't count as publication. What remains is along the lines of… If you call on the King of Wind Demons, [name redacted], he'll grant you wishes. If you want to have fun torturing your slaves, demons can help. The other planes will be swarmed over to make more Abyss, and obviously they are hateworthy and should be destroyed/enslaved/corrupted, just like every other demon lord besides the current publisher.
There's a lot of publications from the Maelstrom! They contradict each other a lot, but do form a vague consensus that the Hell-Axis-Heaven cluster is really boring, and Elysium and the Abyss are less boring even if they let weird stuff distract them from fun sometimes.
Despite the difference in attitude across Heaven and Elysium documents, the Upper Planes documents reflect the same broad consensus: Archons think that Azatas are reckless and Azatas are disappointed by Archons' adherence to patently immoral interplanar treaties, but they'd all be thrilled for any kind of Upper Planes victory. People move freely between different gods' domains, and even the God of Blissful Ignorance and the God of Libraries can be friends. The Upper Planes think that Axis and the Maelstrom are concerningly willing to commit evil acts but at least are amoral not actively evil, and that Hell, Abaddon, and the Abyss are all horrible atrocities that ought to be ended as soon as possible.
As for the identity of this Griffie succulent, Bar can loan but not sell her copy of a meeting of the gods for which Griffie was present and discussed.