EX(PLANET)ARY: Solarballs and Young Wizards lore comparison

Going by characters (Sol/The Sun, the Gas Giants, Ice Giants, Dwarf Planets, then the Rocky Planets), then arcs (Earth Arc, Terraforming Mars, Surviving Venus, Moon Revolution, Planets By Size mini-arc, Planet X, Theia/Proto).

Also note: when it comes to pronouns, I will default to those used in SolarBalls unless I have a really good reason not to.
DRAMATIS PERSONAE

The Sun: Neurotic, controlling and traumatized in SolarBalls, but we haven't actually heard from him in Young Wizards! However, on the shortlist of Things That Have Happened, he has:
-Been turned off (courtesy of the Lone Power, aka Starsnuffer) (this was fixed)
-Had emergency surgery performed by teenagers
-Accidentally absorbed a soul when one of those teens (who actually IS trained in star-surgery) later called on his power to help fight an ancient Star-Eater (not the Lone Power)
-Per Young Wizards canon, all stars have a 'soul' that can go wandering and sometimes takes a host in a given species (either in its own star system or an entirely different one if it makes a 'wrong turn'). The Sun's got stuck in a particular family line in recent times, and at the end of Games Wizards Play this soul (the Simurgh) FINALLY gets released. The soul uses female pronouns in this book. The person she possesses is, in particular, a misogynistic ASSHOLE who only really has it dawn on him that his behaviors were seriously out of line after the Simurgh leaves.

The Sun's had a wild time of it, is my point here. 'Single mother struggling to do things Right' is possibly the right vibe. May be just as neurotic as in SolarBalls, but we don't get to see it.

Jupiter: The oldest planet, also the oldest Planetary (term used in Young Wizards canon to denote 'in charge/responsible for what goes on, wizardly speaking'). Bit of a subdued goofball in the one scene in canon where he ACTUALLY appears (Please read Games Wizards Play, SolarBalls folks!!! Jupiter/Saturn is canon!), but is also referenced as having looked after Mars in the aftermath of a time-travel-related immigration ordeal. Him being The Big (Smart) Guy makes just as much sense in Young Wizards as what we see in SolarBalls... but he's a little less stressed/guilty about the Grand Tack in YW as he is in the show (see below).

Saturn: Second-oldest; Young Wizards-'verse Saturn would know full well what happened to his moons... and sometimes they still speak to him. Yes, the remnants of things can sometimes still have an echo effect! All the other moons know where the ring-moons went, but while they're none too happy about it they do take not increasing entropy unduly seriously... some of his moons (currently undecided as to which ones) are wizards, having taken the Oath as the Powers offered it and practicing their own methods of guarding and guiding Life. Saturn is very proud of them.

Uranus/Caelus: Since names are actually very important in Young Wizards canon, laughing at someone because of their name is much more recognized to cause Problems. He is still very serious about how his name is pronounced, but is rather more respected in turn than he is in SolarBalls. He still messed up with his moons in a fairly big way, millennia ago (more of them are wizards, proportionately, than Saturn's group, and they are QUITE reserved due to past confrontations with the Lone Power), but by this point they are mostly all on cordial terms again.

Neptune: Having the time of his life. While in SolarBalls canon he is very isolated on a regular basis, he is much less so in Young Wizards canon - since wizards (human or otherwise) can come visit whenever they like so long as they pack an atmosphere. Greets any incarnations of the Powers That Be the most casually out of any celestial being in the solar system, sometimes to the panic of others. Only three of his moons are wizards (which may or may not include Triton; again I am undecided), but they always have the MOST fun when the Invitational (Young Wizards canon - event that happens every 11 Earth years that fosters support for up-and-coming wizardly talents) comes around.

The Dwarf Planets (Pluto&Charon, Makemake, Haumea, Eris, Ceres, ???): The discrepancy between Pluto/Aidoneus in Young Wizards (again, PLEASE read Games Wizards Play if you get a chance) and SolarBalls is great, yet hilarious. In YW he is MUCH more calm, secretive, and laid back... and even refers to Sol in a positive manner. (Yes, this IS a shock coming from the SolarBalls side of things.) But in YW, Charon doesn't get shown at all! The compromise? The Dwarf Planets' D&DP (yes, that does stand for Dungeons and Dwarf Planets) is a BIG hit with cross-cultural outreach, and every time the Invitational rolls around most of them are out socializing with local wizards. Charon was with them, and possibly 'the kids' (Styx, Nix, Kerberos, and Hydra). She is the better poker player of the binary dwarf planets, also. Pluto is now the Soccer Dad of Dwarf Planets, you heard it here first.

Ceres being the most clearly nonverbal of the Dwarf Planets can carry over to Young Wizards as well; when in a non-celestial form, he can practice sign, though the involvement of wizardry to begin with means he has access to a decent array of AAC, as well as more people who respect the presence of AAC.

And lastly, see that ??? ? That is because, due to the deliberately ahistorical events referenced in A Wizard of Mars, there is ANOTHER dwarf planet to account for, and its disappearance happened around the same time the world of the Shamask-Eilitt was destroyed... and around the same time the Earth&Luna were formed. I am shaping this into a plot that approximates where Planet X The Rogue Ice Giant would have been, narrative-wise. More on that later.

Mars: The Shamask-Eilitt emigrated from their destroyed world to Mars during the time when he was still habitable; due to a combination of time travel and faulty soul stasis for those beings, the time period they were actually ON Mars was at least 35,000 years ago, and likewise hidden from humans through the use of wizardry. The kernel of Mars (every person/place/thing has a kernel that describes the running of its body/soul matrix and the physical rules that govern its existence) was fragmented by these people, briefly stuck inside another living being, and used to terraform the planet.
... Yeeeeah, his wariness of people living on him is earned, if we adapt his SolarBalls attitude to Young Wizards canon. Due to how Nita Callahan and Kit Rodriguez played big roles in ending the aforementioned kernel-manipulation and terraforming, he is deeply grateful to them, and very much shy in actually talking to them. (Luna is trying to break him out of this mindset. Jupiter is slightly more tolerant, but also just glad it's not a hero-crush.)

Mercury: (Yes, I AM doing Earth last, muahaha.) I thought I would have something Significant by this point in my writing, whoops. His SolarBalls personality and skillset is basically that of the abused child: jaded, sarcastic, but exceedingly self-aware and good at reading others, especially if they intend him harm. Adjusting this for Young Wizards purposes, he is equally afraid of being hurt by the Sun, and protective of him from the Lone Power's machinations. Tends to incarnate among Earth's populations a lot, like certain Powers do. Is either a wizard-planet or exceptionally well-versed in how to work with wizards.

Venus: Can planets be trans? Both SolarBalls and Young Wizards are canons where you can say "Yeah, probably." Venus transitioning over a wide span of time may be more plausible in Young Wizards than SolarBalls, given that SolarBalls!Earth has no idea Venus could have looked/presented otherwise before the timeframe he remembers. And Venus has taken much more than a century to develop his atmosphere, much less ways to cope with it. Is rather fond of the other (less-female) ways humans have coined to name the Morning/Evening Star, even if that does risk drawing in the attention of the Lone Power... and the Hesper, Their Counterpart, once she emerges within the worlds. Can a planet turn out to be an Avatar/host for a Power? We may yet find out!

Earth: /deep breath/ OKAY SO
In Young Wizards canon, Earth is NOT the first world to develop life. (Shock, bother, offense!) However, he has been attacked... multiple times... presumably because the Lone Power is personally offended by Life flourishing. One time (the time that killed Proto and Theia, who were the first to oppose the Lone Power and Its offered Choice) was characterizing, but he did not form with those memories and neither did Luna. Two, three times, that's annoying! Having to keep trying again, but being interrupted by stellar phenomena, what other planets happen to be doing, targeting from all the way across the galaxies... by the time the dinosaurs go extinct, Earth isn't just mad, he wants to know why.

And so the Earth goes looking for an answer, learning about the legacy of Theia and Proto long before humans exist. But where the Planetary status on Earth yields mostly to whatever species is dominant at the time (meaning we never hear directly from the planet in Young Wizards canon), moons have a little more leeway.

Luna/Artemis (which will be my name for Dark Side because it's not something I've seen in SolarBalls fandom before... and there's no one to stop me) is offered the Oath twice, once for each self/personality. Both pass, and have distinct specialties: Luna, water and the tides; Artemis, shielding and diplomacy. They do cross-train, and both are quite invested in socializing with wizards, especially as the time of being colonized draws near.
(Following this line of thinking, they would have absolutely had a role in Wizards at War, where that Star-Eater manifests as The Wolf That Ate The Moon and tries to attack Sol System. The duo can't steal the show, but they do main the power for the shielding and atmosphere to support Earth's young wizards in their attempts to fight back. ... They also get to hug Ponch, because Ponch is a good boy who has love for ALL species.)

ARCS
Earth Arc: Would not happen in Young Wizards canon, because planets breaking their own orbits in such a dramatic way usually doesn't happen there. Earth is still absolutely Going Through It thanks in large part to humans, though. The Lone Power has a lot to answer for.
Terraforming Mars: See above with the Shamask-Eilitt for why this would not be happening as it does in SolarBalls canon... but Mars' attitude DOES have a matching explanation in Young Wizards, which is useful. On the other hand, if a fully-self-aware robot like SAR ever got deployed, there would be a whole-ass team of wizards gunning to show up and provide support/prevent an angry self-justified robot rampage. The Mobiles (a species of sentient computer-wizards) would also want to lend a hand/throw SAR a life-line if he wants out of his current mission and to see a more exciting side of the universe).
Surviving Venus: Also probably wouldn't happen (maybe Astrodude is a wizard, deliberately not using his real name until he is more comfortable with planets and such directly talking to him???), sorry.
Moon Revolution: Okay, this one DID happen, but loooong before humans existed. Earth vented about how difficult hosting Life was (see: all the Mass Extinction Events), and how he knew he was part of a team but it didn't feel like it, so what was he missing?? Titan overhears this snippet, takes it the wrong way (thanks, Lone Power), Ganymede and Europa capitalize on the discontent and things briefly (as in, for a century or so) descend into violence. As in SolarBalls canon, the Dwarf Planets break it up, with Sol's blessing.
Planets By Size mini-arc: Doesn't happen because of physics (see above), and also hopefully YW!Sun wouldn't think of this as a disciplinary idea??
Planet X: this arc is approximated by the following: two adopted/rogue exoplanets, one unassuming comet, and one overshadowed dwarf planet. Planet X's personality is an amalgamation of the personalities of one of the adopted exoplanets and the overshadowed dwarf planet; the 'souls' of those planets have since been reincarnated - one with the potential to have wizardry, but always placed in a position of maximum adversity, the other never to have wizardry again, but not in any true distress.
Theia/Proto: the first planets to reject the Lone Power's choice, to rejoice in Life and defy Its will, and were destroyed for it. Like the two above, they also reincarnate continuously, usually without memories of their first life... but still often finding each other. For those who read the Feline Wizards books, both these two and Luna/Artemis parallel the Seer/Doer pair of Arhu and Siff'ha'h. One has the Sight, oracular ability, and the other is exceptionally powerful but wanting for ways to use it.