Cosma the Invader Girl(Alaskan Urusei Yatsura dub)

Look up Alaskan newspaper archives of the era and search for the name. By the late '80s, early '90s most major newspapers had TV listings for the local channels and the major cable ones.

This allegedly aired in the late '80s to early '90s. Even in markets with large populations (which Alaska is not), most cable systems only had a few dozen channels at the max. It wasn't until the late '90s to early '00s, with the advent of digital cable, that the channel list exploded to a number newspapers couldn't keep up with. I suppose there is a chance this ran on an independent station that didn't submit their schedule info. It would help to know which part of Alaska this individual is from, if only to narrow down the possible channel list.

I am sceptical this exists, solely because Alaska is an odd market for an anime dub to show up exclusively in. The person telling us this story also seems to remember a lot, despite this happening nearly 30 years ago. Yes, Albert & Sidney is a thing - but as Scheepers pointed out, it was brought up by multiple Barbadians over the years. A similar story with the dub of The Bush Baby. There wasn't any footage of that until someone uploaded their home captures, but there were multiple people talking about it.

Kobochat has removed the article due to the noted reliability issues. I've removed a reference from Wikipedia.

I agree this sounds fishy, but something supporting TurboGuppy's claims is that it is clear from their other posts that they actually live in Alaska, and that TurboGuppy made another post on the Urusei Yatsura wiki from an Alaskan IP address here, which seems like a genuine request for help: uruseiyatsura.fandom.com/wiki/Urusei_Yatsura_Wiki_talk:Community_Portal. However, TurboGuppy's posts show that they are an anime fan, which would explain why they decided to make this hoax if it was a hoax, and they were also an Archie Comics fan, explaining the "Reggie from Archie Comics" reference in the story (TBF from what I could gather, while Reggie in the Archie Comics does have a similar role as a rival to the protagonist the way Shutaro Mendou does, he's not super rich like Mendou is, so maybe the similarity is a coincidence)

Also, "Ronnie" (Shinobu's supposed name) seems like an odd choice, and given that Ataru's name was Ronnie in the French dub I could see TurboGuppy pulling it from that

Something else which doesn't add up to me is the theme song. The lyrics don't quite scan right to me, but TBF that could be because TurboGuppy doesn't remember it exactly.

Oh yeah, that one too. Even freakin' SPACE CATS had that kind of information!!!

I think that was the case for a bunch of Commodore 64 games by unknown developers, though with those games they just appeared on the internet at some unknown time, & again, nobody knows who made them.