I think I like Surge because she's objectively like. Kinda mid? She's like, Knuckles level powerful. She can't even beat base Sonic in a 1v1, you can forget about Shadow or Super Sonic. She's an underdog. And that makes her interesting. She dodges any notion of being someone's edgy overpowered OC because she's up against Sonic the fucking Hedgehog, and Sonic is just that guy. It makes her easy to root for.
This image goes so fucking hard
This is NOT the framing you give a villain for Sonic to fight, she is a pure underdog here
Honest, Surge also brings with her an interesting, refreshing scenario with her and Kit's recent arc. It's not another Eggman level genius scheme, it's not end of the world stakes, its not magical and its very light on science fiction. it's just some random manipulative jerkwad junk scav/salvager/shyster styling himself like some bigshot mafioso. earning public approval to undermine the heroes while rubbing Eggmans constant stream of failures in his face.
Surge is not just cool because she's an Underdog, it feels like she brings with her more a chance to experiment with the Sonic formula, which the comics were already pretty good at.
As another subtle example, her being able to get the same facial reaction that sonic was able to get out of her earlier with his trademark teasing. A good example of her interacting with him as an equal.
I also like the logo of Eggman looming large behind Sonic, overlapping with him, because though it’s less direct, Surge is raging against Eggman and the cyclical narrative he’s equally responsible for too. After all, without Eggman the Starline who made her and Kit wouldn’t have existed. From her perspective, Sonic and Eggman are not diametrically opposed. They’re united in being the Main Characters who always do what they want, no matter the cost; and being powerful on a level that no ordinary person, not even one with superpowers, can stand up to. Kit was right when he said that they both want him and Surge to conform with their interests (but wrong that Sonic doesn’t also genuinely want the siblings to be happy). They both have their own styles that they won’t change. If you believe that change is the best, most necessary thing, they’re both your enemy.
Adding onto the original point about the gap between Sonic and Surge, there’s a similar gap between Tails and Kit. Tails has extraordinary, exceptional intelligence to rival Eggman’s, and incredible skill in a wide range of scientific fields from astrophysics to biology to mechanical engineering to computer science. His mind is as freakishly capable as Sonic’s legs. If he can dream it, he can do it given enough time and materials. And Kit… just can’t compete with that. Kitsunami, who is canonically a few years older than Tails (Starline assumed Tails was older than he was, because eight is ridiculous; I put Kit at ten), is an extremely intelligent child. But he’s closer to a real-life prodigy than the likes of Tails. He can effectively use his special equipment due to training and has great strategic and digital prowess, but we haven’t seen him show the general mechanical expertise or gifts for other scientific disciplines that Tails effortlessly exhibits. He hasn’t invented any new machines of his own, for example. And remember that Starline taught Kit, while Tails hasn’t had any formal education in science that we know of.
No, Tails didn’t need to be taught. He didn’t need cybernetic implants. He wasn’t his mentor’s intellectual protégé - Sonic knows far less than him. All his friends and allies know less than him. He has natural talent. He taught himself, while he was homeless, while living independently, while regularly busy with heroics. Tails is running circles around Kit at a younger age. Kit would be a kid genius in our world, but in Sonic’s world he’ll always be overshadowed by a fantastical outlier. He isn’t stupid, just as Surge objectively isn’t weak, but by God can the people they were created to surpass and replace to make them feel like it.
Yet another reason, on top of Tails being happy and fulfilled and emotionally secure and confident and having many strong bonds of unconditional love and being a more ‘useful’ sidekick and repeatedly defeating Kit and breaking his trust (even accidentally), why it makes perfect sense for Kit to hate his guts. Tails is everything he wants to be! And thinks he’s failing to be! That’s painful!