While I do somewhat agree that the main protagonist of a game series has a very good chance of getting into Smash. I hate rule five because it implies that obscure 3rd party characters like Dr. Yuichiro Tomari from Ordyne or Mao Mao from Aero Fighters are worthless characters only because they're not well known and it would be a silly idea to permenentally deconfirm them from Smash Ultimate because they're not 'iconic'.
You are almost correct. It's not a permanent deconfirmation, excessively/incredible/extremely obscure characters, can be undeconfirmed if they become famous later. And well I've already aforementioned that 3rd party characters regardless of how iconic are allowed to be playable. Also, for an obscure 3rd party character to be deconfirmed, they need to be extremely obscure, not just mildly or moderately obscure. For example, Pulseman is relatively obscure, so he isn't deconfirmed.
Goku, Scourge, and Hatsune Miku aren't video game characters so they really aren't very good ideas for Assist Trophy replacements.
But how do you like the rest of them? I think Crono (chrono trigger) replacing Isaac, Lilac (freedom planet) replacing Knuckles, Emerl replacing Bomberman, and especially Papyrus replacing Waluigi are perfect assist trophy replacements.
Here are some more ideas I thought of for assist trophy replacement mods.
Sally (sonic) over Dillon.
Beck (mighty no 9) over Shadow instead of Scourge. (Because Beck can use the double gear system in my fanon.)
Frisk over Prince of Sable.
Sans over Jeff.
Shoma (yugioh) over Rodin.
Do you have any more ideas for assist trophy skins/replacement mods?
Kai somehow thinks the inconveniences Sakurai doesn't want to deal with regarding the licensing of non-video game characters somehow magically go away when the characters are ATs.
These are for my mods, not official concepts. And I already know that 4th party characters, and minor characters (with piranha plant as an exception) are automatically deconfirmed.
I know the stuggles for licensing don't and can't just disappear when relegating Goku, Sally, Miku, and Yu-(insert suffix here) to assist trophies.