So, in one of the other Daima threads, I talked about how I personally approach Dragon Ball now with a certain willingness to detach the logical side of my brain and see the franchise for the fun, goofy, adrenaline-soaked slop it's always really been. As with all my favourite media, I like nothing more than a bit of deeper analysis of the themes, characterisation, etc, but when discussing Dragon Ball, there's a limit; an invisible line that can be easily crossed into tarty pretention, or bigging the series up into something profoundly intellectual when that really couldn't be further from how it was conceived. It's like in How I Met Your Mother when the gang make fart noises whenever Ted talks too highbrow. Dragon Ball is great and successful because it's so simple, but it's simplicity done right. Which many good artists, writers and musicians will tell you, is a deceptively hard task.
With all that said...
If I had to crowbar some thematic point into a controversial plot point in the latest Daima episode, I've given it some thought and realised that there is an argument to be made for it.

Let's get the basics out of the way. Super Saiyan 4 is back. Or something very similar to it. Once you get over the initial "what the fuck" reaction I'm sure we all had on some level, the way it was incorporated into Daima, and by extension the "modern canon" of Dragon Ball, was... questionable, it's fair to say.
A big point of contention here is the level of foreshadowing and narrative weight to the transformation.
In GT, Super Saiyan 4 was given a good amount of narrative build-up. To briefly recap, while training in the Kaioshin Realm, Goku's tail begins to regrow, and Elder Kaioshin realises that it could be the key to defeating Baby. They spend a good while forcefully prying the tail out of Goku's ass. It's no high-gravity or time chamber training, but it's something. After fully regrowing it, he uses it to first transform into a Golden Oozaru, before transforming further into Super Saiyan 4. SS4 finally allows him to tap into primal Saiyan power while retaining his sanity. It also gave Baby, a firm believer in the Tsufruian race's superiority over the savage Saiyan oppressors, a hefty dose of poetic irony.
In Daima, the Legendary Namekian Neva uses his magic to unlock a deeper level of power within Goku while he lies barely-conscious on the floor, apparently sensing great potential within him. This causes a reaction in Goku's very DNA and... voila, new transformation.
A new transformation was always on the cards, and many fans were expecting something either tied to the Demon Realm or the Nyoibo. Perhaps a furry, golden, Sun Wukong-inspired form with pointy ears. Can't lie, those options would've been quite dope, but what we got perhaps wasn't so random.
Throughout Daima, beings from the "Outside World" (i.e. the "main universe", or Universe 7) are discriminated against within the Demon Worlds. Ever since Supreme Demon King Abura blocked free movement between the Demon Realm and the outside world, most Demon Realm citizens go their whole lives without ever encountering a round-eared person, especially since Warp-sama forbids passage on the grounds of ear shape.
According to Nahare's abridged history of the entire cosmos, the relationship between the Demon Worlds and the Outside Worlds is the opposite of what we as viewers naturally presumed. The Demon Realm is not merely the underside of the coin, but the original plane of existence that the rest of the multiverse spawned from. Indeed, most pointy-eared life forms in Universe 7 are directly descended from Demon Realm species, whereas most round-eared species, including the Saiyans, are merely the result of the Kaioshin's experiments to create new life.
With this added context, it's perhaps easy to see why the likes of Dr. Arinsu and other demons would take a supremacist view towards "lower life forms" from the Outside Worlds, in the same way that humans might view microscopic creatures grown in a petri dish. Her kind were already around for millions of years by the time that Saiyans were crawling out of their mud huts.
Goku's lifetime of adventures. Freeza's galaxy-spanning empire. Except for Majin Buu's rampage, none of the significant events that happened in Universe 7 are on the average-demonic-joe's radar at all. Of course, this leads to citizens of the Demon Worlds underestimating Goku at every turn.
One aspect of SS4 that makes it resonate with many fans is the aforementioned "primal" power of it. It draws out the buried roots of Goku's Saiyan nature.
In Daima, that aspect is, if anything, amplified even further. In his shrunken body, Goku gains enlarged Popeye-like forearms that allow him to run on all fours. Mini SS4 Goku moves in a way that is reminiscent of his "Crazy Fist" stance he used against Jackie Chun way back in the 21st Tenkaichi Budokai.
There's a defiance in Goku using this bestial transformation to battle the powered-up King Goma, who believes in the innate superiority of the Demon Realm races (and himself above all others). Of course, this ties back to how SS4 was originally used to make Goku even more of a foil for Baby in GT.
As for in-universe explanations for how Neva was able to unlock a whole new transformation with a wave of his hand, there's definitely some precedent for Neva possessing amped-up magical abilities that no other Namekian can come close to matching, owing to Neva's highly revered status among his kind. His ability to instantaneously gather the seven Earth Dragon Balls to one place and power up Shenron in the first episode was the mere tip of the iceberg. This display is nothing more than an improved version of the same potential-unlock ability displayed by the Grand Elder way back in the Namek arc. I wouldn't be surprised if Neva is later revealed to be Zalama's father or something.
It feels that Super Saiyan 4 was used here for much the same reasons as it was originally: to prove a thematic point about Goku weaponising his Saiyan heritage in the face of powerful alien beings who would see him as an inferior life form for his savage nature.
…
Or maybe it’s all just GT fanservice to sell more action figures. That’s probably it.


