Avian Arts

Maybe, instead of being brainwashed into being a pawn, he is pretty much a part of Giygas's army to begin with, albeit in a more diplomatic role. Though maybe not willingly, as I like to personally think at least some of Giygas's forces are blackmailed, but in canon he folds quickly.

Since he as originally a real estate agent in canon, he could probably do something like that here on a galactic scale. Earth has quite a few nice places that alien travelers could make their home. Too bad Giygas's plan devolved into destroying everything rather than just take over.

He passes himself of as a totally normal businessman, passing off as a sort of overnight success and someone who works in the shadows-- his canon self already is like that as is anyway. He would make use of mind control, and by developing his own cult of personality, would subjugate the Foursidians en masse. No Mani Mani statue needed.

However, he is still not much of a fighter. He's got decent psychic prowess by the virtue being an alien, but he mostly relies on the basics like telepathy and levitation. Ness and co. probably would end up being much stronger than him.

So, here's Tony's 2d artwork from the aforementioned guide:

First of all, Tony is apparently a chonky boy. He is not outright drawn as fat like Porky or Apple Kid, but he still looks rather wide. This whole time everyone drew him with the same build as Jeff when in actuality, he is rather stout in comparison! I assume he is more discretely chubby, like Ness is implied to be.

And then, there is his eyes. He's got pie shaped eyes like Paula and other female characters (which I guess are these sparkly eyes). In fact, as far as I could tell, he's the only male with these kind of eyes. I guess they needed to give Tony some kind of feminine features. Though between the eyes and his proportions, it seems like he's meant to have this childish and innocent look in contrast to Jeff.

Finally, there's the uniform, which is the biggest design discrepancy. It looks like he has no blazer, but looking closely, it looks like they simply forgot to color it in! There's outlines for it, but it looks like he has suspenders at a first glance. With that in mind, it becomes much closer to the sprite, though there's still some differences like the color of the uniform and the shoes.