Theory: Rouxls Kaard is an Annoying Dog analogue

This is a theory you probably could've made before Chapter 5, but what got me thinking about this was the ending of the Weird Route seeming to confirm Device Theory.

People have noticed before that Rouxls Kaard kind of looks like Mystery Man, maybe particularly in his shop sprite from chapter 1, and I'm proposing that this is basically Gaster's Darkner OC.

What has been interesting to me about him has been how negative literally everyone is to him whenever he appears. I can't think of a single line of dialogue where anyone says anything good about him besides the Weather duo calling him hot, but even they add that he's really weird on top of it. People will go out of their way to call him out as being weird or having bad proportions even when he's just hiding as a lampshade in the same room. For such a relatively minor character, he gets a lot of negativity thrown at him just for being kind of annoying.

However, I'm saying that Rouxls Kaard isn't the only character with this treatment, just the most prominent one. The Annoying Dog also gets this treatment. Dog Dollars go down in value every chapter. Noelle asks who would want an annoying dog. The Annoying Dog shows up to move the plot forward rarely, like in Queen's Mansion in Chapter 2 when it helps us break out of the room with all the tables, but otherwise just gets in the way and does nothing helpful, like Rouxls Kaard. Within Deltarune, nobody has to stand up for the Annoying Dog, because it's just the author's stand-in. It got a lot more of this treatment in Undertale, when it had a prominent appearance in the Papyrus boss fight.

Even Trashy, the joke character meant to be annoying, gets treated like a proper enemy in chapter 5, and Nubert works with him well enough. The Mikes see the Trashy Trio and try to beat them up. But in that same scene, Rouxls Kaard steps in and suddenly everyone just wants to get out of there. Rouxls Kaard's treatment is way disproportionate to how he acts.

Like the Annoying Dog, Rouxls Kaard also seems to be both very powerful, and unable to do much with that strength that isn't funny. Why can Rouxls Kaard teleport anywhere in a big pillar of light? He seems to be able to manipulate the battle menu with the Rules Card in Chapter 3, a power he seems to also give Tenna in exchange for his credit card. And I'm not sure if this is 'power' or not, but he also has that one time in Chapter 3 where he manifests hands over his dialogue portrait to better portray his point.

What does this mean for the story of Deltarune if it's true? That Gaster can see us through Rouxls? He probably doesn't need Rouxls to see us. That Gaster saw the Annoying Dog, knew it represented a bigger entity, and decided to get himself something like that? Maybe, but I don't know if Toby Fox would ever make his dog self-insert directly a part of a serious plot like that. That Gaster wants to play with us, and puts his own character into the story so he can, what, have fun or something, and self-insert charactere are naturally predisposed to being rejected by the world around them? Maybe, although Temmie seems to be doing fine for herself and actually gets complimented by Susie once in Chapter 5 despite being a self-insert, so who knows.