I should've made this blog years ago

Argit definitely should've been a 3rd Protagonist in Omniverse alongside Ben and Rook

Just hear me out, Argit's character bounces off so well against Ben and Rook's characters

He is a PERFECT foil to Rook.

-Both are Aliens who live on Earth but while Rook is clearly a Fish out of Water, Argit already seems to know well about Earth Culture and blends right into it

-Rook is a "By-the-Book" Cop who has a very Black and White sense of Morality, while Argit is a Sleezy Conman and is in the Grey Area of Morality (granted it's a rather dark shade of Grey but it's still Grey nonetheless)

-Rook is an Alien based on Cats and other Felines while Argit is an Alien based on Rats and other Rodents

Ben could be a perfect balance between the two. While Ben is a Hero, he is also kinda a dick tbh.

Rook and Argit could play roles like being the Angel and Devil on Ben's shoulders.

And I just think Argit and Ben's interactions are funny lol

Anon I am gonna agree with you for the following reasons-

I've been saying for a while that the story overall would've been improved if he'd been the one to join Team Tennyson rather then Kevin. You'd have to make him a lighter shade of morally grey (personally I'd do it by leaning more into the sort've characterization we got in the Rooters Arc, where he's shown as more loyal and courageous even if the bar is low) but it would avoid the rushing of Kevin's change to a 'good' character while still allowing him to be in the show, remove what I still hold is a poorly done romantic subplot or at least force it to be done differently, add an alien to the cast earlier without having to go 'everything is aliens so technically', and as you said, at least halfway, his interactions with the Tennysons are still plenty amusing and leave room for some interesting dynamics.

The fact Argit and Rook aren't played against each other more pains me. Because as you said they could be made into good foils but also the 'new immigrant to a strange land and established immigrant to that land' dynamic could be so good. Plus you get the option of the more inexperienced Rook as compared to the more worldly Argit (Rook went from a backwoods planet where his connection with the rest of the galaxy was via radio to the Academy and then to Earth, meanwhile what we see of Argit starts out in the Null Void, travels the galaxy with Kevin, and then comes to Earth (which also is 100% why he's better with Earth stuff than Rook- he had years travelling with an Earth native and then a few years living on Earth before OV starts, while Rook has nothing but Ben's file and whatever info the ethernet has on the planet to go off at OV start)). This stuff could be very well played with.

Plus, a point of the foil scale you didn't mention- Argit's belief that you shouldn't try to make your partner someone they're not (including just accepting sudden changes in behavior just because they fit what you want them to be) as compared to Rook's desire in early OV for Ben to meet his expectations, to the extent that when Ben is swapped with he ignores the red flags because 'Ben' is acting more like what Rook wanted him to be. Could be interesting to have that as a running thing in the background, Rook's disappointment vs Argit's acceptance, before it comes to a head in that episode.

Also, because you know how people are with narrative foils, the chaos that would erupt between Rook/Argit fans (you know they'd happen) vs Rook/Ben fans (which already fucking happened). Actually thinking about it it'd probably be more Ben/Argit fans circling the tags opposite Rook/Ben fans, because this fandom puts shipping Tennysons above any other ship in existence, but the three options would dominate and be a complete mess. I dread and yearn for the shipping maps people would come up with.

-Seriously, it opens so many options there that the fandom would've gone absolutely ass over tits wild. It'd have been total anarchy. We got a bit of a mess when it was Gwevin and Benlie vs Bevin, can you imagine this?

Then you get the opening for more Argit background, which more background for characters is always a good thing, and since OV was bigger into worldbuilding we'd have probably gotten more info on his species. You can even get episodes contrasting him and Rook and how they got to the places they are in life (the farmboy from a strict conservative culture who heard stories of heroics and decided to leave home to pursue them, becoming a cop due to his hero's association and probably also because his upbringing made the cop thing seem like a Good vs the homeless and family-less child who presumably first turns to crime due to lack of options and then grows to fit that mold due to his young age at start). (even if Argit had anything pre-Rooters, he sure as fuck only had Kevin after, and Kevin we know is in that position) (and hey opening for more about their relationship)

And of course you get the interactions as a trio, as you said Rook being the Lawful Good influence and Argit the Neutral Evil (probably working towards true neutral) influence to Ben's Neutral Good. Plus, you also get the Sliding Scale of Alien Knowledge- from Argit's 'I am an alien and I've been living among a wide variety species if not my whole life than for over half a decade' to Ben's 'I have canonically about three/four years experience becoming and fighting a wide variety of species' to Rook's 'I am an alien and have been living among a wide variety of alien species for maybe a year, probably a matter of months'. Group arguments, group agreements (sometimes of the most unlikely sort), two guys ganging up to tease the third, a running gag of Argit lamenting that Ben and Rook are wasting themselves on fucking law enforcement. An episode where Argit and Rook both have fleas and spend it arguing about who gave them to who. And episode where they both confront Ben on his tendency towards speciest comments and that get handled. The fucking Rooters arc and what changes there. And the appearance of Argit 10 in the multiverse episodes would take on an entirely new common view (closer to my own because come on Paradox was only bringing them to Good Bens), he may have even joined the group there.

Obsessed with this shot of Argit